Papers - IDOTA Sachiko
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Zhong Z., Niimi M., Tobisa M., Idota S., Ishii Y.
Agriculture (Switzerland) 14 ( 8 ) 2024.8
Publishing type：Research paper (scientific journal) Publisher：Agriculture (Switzerland)
Amaranth (Amaranthus hypochondriacus L.) is a potential forage crop with a high yield and crude protein (CP) content; however, establishment methods need to improve for the crop to be less sensitive to typhoons. Optimal establishment, cultivation, and utilization in amaranth were examined in a variety of seasons and methods of establishment in 2021–2023. Four methods were examined: (1) direct seeding in rows, (2) direct seeding in spots, (3) soil seed balls, and (4) transplant pretreatment methods under a randomized blocked design (n = 3). Sowings every month from April to August were applied only in 2021, while establishments in April, May, and August with both pretreatment methods were applied in 2022 and 2023. The establishment in August successfully escaped damage from typhoons. The direct seeding of either rows or spots showed marginal success in establishment compared to stable establishment in pretreatment methods. In 2022 and 2023, the highest yield and CP content were achieved in soil seed balls plots in April and in both pretreated plots sown in August, respectively. The quality of silage fermentation showed a high pH, ranging from 4.52 to 6.39, due to the high CP content in 7.59–18.36% dry matter (DM). Sowing in April or August established with soil seed balls can avoid typhoon damage to have stable forage yields and can be processed with a favorable quality of amaranth silage in the region.
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Tashiro K., Ishitani M., Murai S., Niimi M., Tobisa M., Idota S., Adachi-Hagimori T., Ishii Y.
AgriEngineering 6 ( 2 ) 1847 - 1858 2024.6
Publishing type：Research paper (scientific journal) Publisher：AgriEngineering
This study assesses the impact of defoliation applied to three developmental stages across three cropping seasons from 2021 to 2023 on growth, yield and forage quality in maize. The experimental design included three treatments: defoliation of three expanded leaves at the 3rd–4th leaf stage (DF1), the 5th–6th expanded leaves by leaf punch (DF2) and expanding leaves with the DF2 treatment (DF3) at the 6th–7th leaf stages, compared with no defoliation (control). Over three years, the most significant decrease in dry matter (DM) yield occurred in DF1 during spring sowing, while in summer sowing, the largest reduction was in DF3, both of which were correlated with changes in the number of grains per ear. The DM yields at harvest were positively correlated with plant leaf areas at the silking stage. The digestibility of forage in in vitro DM decreased concomitantly with an increase in acid detergent fiber content, indicating a decrease in forage quality. Given the frequent severe damage observed in summer sown maize and the detrimental effects of early growth stage leaf feeding on quality and quantity of spring sown maize, the application of registered insecticides is advised to reduce pest damage to maize crops.
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Ishigaki G., Niimi M., Shigedomi H., Sasaki Y., Idota S., Ishii Y.
Grassland Research 3 ( 4 ) 364 - 372 2024
Publishing type：Research paper (scientific journal) Publisher：Grassland Research
Background: Pearl millet is characterized by its high dry matter (DM) yields with a high moisture content, which makes it difficult to process as silage. Methods: Pearl millet was sown in mid-September for 3 years to examine its growth, DM yields in early December, and decrease in DM percentage after frost exposure. The crop was processed as round-bale silage to assess silage quality and preference by breeding beef cattle. Results: Plants reached a height of 160–200 cm, with heading tiller percentages of 50%–70% in early December. With frost exposure, DM percentage increased in leaves and panicles, followed by stems, reaching over 40%, 1 month after exposure. These increases were positively correlated with cumulative frost exposure. After frost exposure, in vitro DM digestibility and crude protein content declined while acid detergent fiber content increased. Repeated cafeteria feeding experiments showed a reduced preference for either pearl millet silage or Italian ryegrass hay. The silage showed moderate acidity at pH 4.73–5.40, with lactic acid at 0.58%–1.62% DM, acetic acid at 0.03%–0.10% DM, and negligible butyric acid, indicating a satisfactory quality. Conclusions: In Southern Kyushu, pearl millet sown in late summer can be processed into low-moisture round-bale silage in January, the year following sowing.
DOI： 10.1002/glr2.12096
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Investigation on Spraying Percentage of Droplets at Leaves and Ears using Several Pesticide Spraying Methods in Several Growth Stages of Maize (<i>Zea mays</i> L.)
Ishigaki Genki, Idota Sachiko, Ishii Yasuyuki
Japanese Journal of Grassland Science 67 ( 4 ) 183 - 188 2022.4
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
To clarify a basic knowledge on pesticide application methods against fall armyworm (<i>Spodoptera frugiperda</i>), we investigated the spraying percentage of droplets on leaves and ears covered by water-sensitive paper using several pesticide-spraying methods, including tractor-mounted boom sprayers, handheld electrostatic sprayer, and drone-spraying at various growth stages of maize (<i>Zea mays</i>). In boom spraying methods, the spraying percentages of droplets under the sprayed rate of 200 L per 10 a at the 1st-2nd leaf stage was over than 98％. In the case of 100 L per 10 a at the 5-6th leaf stage, they were less than 50％. For the tractor-mounted boom sprayer, spraying percentages of droplets at the top- and middle-leaves in the 9-10th leaves stage were lower than those at the lower-leaves. On the other hand, the electrostatic sprayer exhibited the opposite results. In drone-spraying at the dough-ripe maize, they were obtained more than 60％ in base and middle part of upper- and middle-leaves under the amount of 100 L per 10 a. These results elucidate important information that contributes to our basic knowledge on the selection of pesticide application methods against fall armyworm. It will be necessary to clarify the relationship between the spraying percentage of droplets and the control/exterminating effect.
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Growth and Yield Potentials of Pearl Millet (Pennisetum typhoides) under Different Sowing Dates in Southern Kyushu, Japan Reviewed
Bokun Li, Yasuyuki Ishii, Sachiko Idota, Yingkui Yang and Mitsuhiro Niimi
Wulfenia Journal 27 ( 1 ) 67 - 80 2020.3
Language：English Publishing type：Research paper (scientific journal)
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Yield and quality of forages in a triple cropping system in southern Kyushu, Japan Reviewed
Li B., Ishii Y., Idota S., Tobisa M., Niimi M., Yang Y., Nishimura K.
Agronomy 9 ( 6 ) 2019
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Agronomy
© 2019 by the authors. Licensee MDPI, Basel, Switzerland. A triple cropping system, combining spring maize, pearl millet, and twice-cut blast disease resistant Italian ryegrass, was examined for the 2016–2017 and 2017–2018 growing seasons to achieve quality herbage production in Miyazaki, southern Kyushu, Japan. The growth of the three crops reached to harvest, even though typhoon and heavy rainfall occurred. Annual dry matter (DM) yield of the triple crops was 4098 g m−2 and 4349 g m−2 in the first and second cropping seasons, respectively. The observed total digestible nutrients (TDN) were higher in spring maize (up to 68.2% and 76.8%), pearl millet (up to 60.0% and 67.9%), and Italian ryegrass (up to 71.6% and 68.6%), during the first and second season, respectively, leading to an annual TDN yield of 2357 g m−2 and 2938 g m−2. The results suggest that the present established triple cropping system is feasible for obtaining high yields with more digestible nutrients in the forages.
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Feasibility of napiergrass (Pennisetum purpureum) as a pellet material for bioenergy feedstuff in southern Kyushu, Japan Reviewed
Yasuyuki Ishii, Chiaki Ooki, Yusuke Iki, Sachiko Idota, Mitsuhiro Niimi, Yuuichiro Miyachi, Shunsuke Okayama, Aya Nishiwaki
Proceedings of the 7th Japan-China-Korea Grassland Conference 2018.7
Language：English Publishing type：Research paper (international conference proceedings)
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Feasibility of early sowing of spring maize (Zea mays) in triple forage cropping in southern Kyushu, Japan Reviewed
Li Bo Kun, Yasuyuki Ishii, Sachiko Idota, Manabu Tobisa, Mitsuhito Niimi, Akira Arakawa, Tomoyuki Takai, Norio Arima, Keiko Nishimura
Proceedings of the 7th Japan-China-Korea Grassland Conference 2018.7
Language：English Publishing type：Research paper (international conference proceedings)
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Agronomic traits of high-yielding sorghum (Sorghum bicolor Moench ‘Tarzan’) in Miyazaki Prefecture Reviewed
Sachiko Idota, Marika Ohara, Riko Kodani, Yasumistu Hongou, Manabu Tobisa, Yasuyuki Ishii, Keiko Nishimura, Norio Arima
Proceedings of the 7th Japan-China-Korea Grassland Conference 2018.7
Language：English Publishing type：Research paper (international conference proceedings)
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Triple Cropping Systems of Spring Maize,Tropical Grass of Teff (Eragrostis tef)and Winter Cereal Crops to CombineTotal Digestible Nutrient Yield withProtein Concentration in SouthernKyushu, Japan. Reviewed
Yukimi Nakata, Sachiko Idota, Manabu Tobisa, Yasuyuki Ishii
Agricultura lSciences 9 129 - 140 2018.1
Language：English Publishing type：Research paper (scientific journal)
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Grazing potential of foggage and fresh dwarf napiergrass pasture by breeding beef cows in southern Kyushu, Japan. Reviewed
Kadwal M.H., Ishii Y., Goto A., Li B.K., Idota S., Niimi M., Ishigaki G., Fukuyama K.
Wulfenia Journal 2018.1
Language：English Publishing type：Research paper (scientific journal)
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Utamy R., Ishii Y., Idota S., Khairani L.
Agronomy 8 ( 3 ) 2018
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Agronomy
© 2018 by the authors. Licensee MDPI, Basel, Switzerland. The effects of two levels of manure application (184 and 275 kg N ha -1 year -1 ) on herbage yield, quality, and wintering ability during the cropping of a dwarf genotype of late-heading (DL) Napiergrass (Pennisetum purpureum Schumach) oversown with Italian ryegrass (IR; Lolium multiflorum Lam.) were examined and compared with chemical fertilizer application (234 kg N ha -1 year -1 ) for 4 years to determine a sustainable and environmentally harmonized herbage production in a hilly area (340 m above sea level). No significant (p > 0.05) differences in growth attributes of plant height, tiller density, percentage of leaf blade, or dry matter yield appeared in either DL Napiergrass or IR among moderate levels (184-275 kg N ha -1 year -1 ) of manure and chemical fertilizer treatments. IR exhibited no significant detrimental effect on spring regrowth of DL Napiergrass, which showed a high wintering ability in all treatments. In vitro dry matter digestibility of DL Napiergrass tended to increase with increasing manure application, especially at the first defoliation in the first three years. Manure application improved soil chemical properties and total nitrogen and carbon content. The results suggested that the lower rate of manure application of 184 kg nitrogen ha -1 year -1 would be suitable, which would be a good substitute for chemical fertilizer application with an equilibrium nitrogen budget for sustainable DL Napiergrass and IR cropping in the hilly region of southern Kyushu.
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Forage quality of triple maize crops with winter barley in Kyushu, Japan Reviewed
Yang Y., Li B., Idota S., Ishii Y.
Asian Journal of Crop Science 9 ( 1 ) 1 - 10 2017
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Asian Journal of Crop Science
© 2017 Yingkui Yang et al. This is an open access article distributed under the terms of the creative commons attribution License, which permits unrestricted use, distribution and reproduction in any medium, provided the original author and source are credited.Background: Intensification of summer and winter forage cropping is an urgent requirement for reducing feeding costs for the beef and dairy cow industry in Kyushu, Japan. Based on the expectation of progression of global warming, the yield following quadruple cropping of triple maize crops with a winter barley crop was evaluated in a previous 2 years trial. Materials and Methods: Forage quality of the previous triple (spring, summer and autumn) maize with winter barley cropping was determined for 2 years in the region. Winter barley, sown in inter-rows in mid-November, was harvested in early to mid-March while spring maize, sown in early to mid-March, was harvested in early to mid-June, summer maize, sown from early to mid-June, was harvested in late August and autumn maize, sown from late August to early-September, was harvested in mid-November. Results: Yield of winter barley was around 900-930 g DM m-2, spring maize was 1440-1800 g DM m-2 with 41-59% ear DM and summer maize was 820-1170 g DM m-2 with 41-44% ear DM. However, the autumn maize yield varied greatly from 330-810 g DM m-2 with 33-56% ear DM due to typhoon and cool weather damage. In vitro DM digestibility (IVDMD) in maize ears was higher than 75% and in leaf blades was higher than 60%, while for barley leaf blade, it was higher than 80%; the values for stems were lower than leaf blades for all crops of both species. The IVDMD was negatively correlated with Neutral Detergent Fiber (NDF) and Acid Detergent Fiber (ADF) concentration (r = -0.790 and -0.856, respectively) at the 1% probability level. By estimating Total Digestible Nutrient (TDN) concentration from ADF concentration based on regression equations, the TDN yield was 2750-2870 g DM m-2 year-1 over 2 years. Conclusion: Triple maize with winter barley cropping can produce 4090-4330 g DM m-2 year-1 with 66-67% TDN concentration in the region, which is recommended as a potential system for intensive ley farming.
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2010年に宮崎で発生した口蹄疫の防疫措置終了後に農場内に留置された家畜排泄物のウイルス残存性調査 Reviewed
國保健浩，真瀬昌司，亀山建一郎，池口厚男，田中康男，吉田和生，山田俊治，大橋誠一，深井克彦，森岡一樹，小野里洋行，堀井洋一郎，西脇亜也，飛佐学，佐伯雄一，井戸田幸子，石井康之，山本直之，上村涼子，末吉益雄，川嶌健司
産業動物臨床医誌 7 ( 1 ) 1 - 8 2016.6
Language：Japanese Publishing type：Research paper (scientific journal)
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Production and quality in dwarf Napier grass fertilized by digested effluent of manre under two-years of dairy cow-grazing in warm regions of Japan. Reviewed
Hadijah Hasyim, Ahmad Wadi, Yasuyuki Ishii, Sachiko Idota and Kiichi Fukuyama
American Journal of Applied Sciences 13 ( 5 ) 479 - 489 2016.6
Language：English Publishing type：Research paper (scientific journal)
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Effect of Sowing Rate on Agronomic Traits of Sorghum (Sorghum bicolor Moench) in Southern Kyushu, Japan. Reviewed
Sachiko Idota, Yasuyuki Ishii, Mayumi Izu, Yukistugu Nishimura
Agricultural Sciences 7 308 - 314 2016.5
Language：English Publishing type：Research paper (scientific journal)
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Hasyim H., Wadi A., Ishii Y., Idota S., Fukuyama K.
American Journal of Applied Sciences 13 ( 5 ) 479 - 489 2016.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：American Journal of Applied Sciences
© 2016 Hadijah Hasyim, Ahmad Wadi, Yasuyuki Ishii, Sachiko Idota and Kiichi Fukuyama.Dwarf Napier grass (Pennisetum purpureum) pasture is suitable for beef cow grazing in warm regions of Japan, while it is not assessed for the suitability by a herd of dairy cows in the region. This study was conducted to determine the effects of Digested Effluent (DE) application on herbage yield and quality, Herbage Consumption (HC) and Dry Matter Intake (DMI) under a paddock scale of rotational grazing by a herd of dairy cows on dwarf Napier grass pasture in southern Kyushu, Japan for two years in 2007 and 2008. Plant growth attributes, such as plant height, tiller number and herbage mass and HC increased consistently from the first to the second or third grazing cycle in the two years. Pre-grazing herbage mass was averaged at 176 and 193 g m−2 in Chemical Fertilizer (CF) and DE treatments, respectively and HC and DMI did not differ between the two treatments. Overwintering ability was almost perfect in Miyazaki, judged by 97.1% of regrown plants in May 2008. Thus, dwarf Napier grass pasture fertilized with liquid DE can be utilized by dairy cow grazing as the same with CF fertilization, where DMI was averaged at 4.4 kg dry matter head−1 day−1 for 3 summer months in the two years.
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Quality herbage production of dwarf Napiergrass with Italian ryegrass cropping under digested effluent application in southern Kyushu, Japan. Reviewed
Hadijah Hasyim, Yasuyuki Ishii, Ahmad Wadi and Sachiko Idota
American Journal of Agricultural and Biological Sciences 11 ( 1 ) 35 - 44 2016.2
Language：English Publishing type：Research paper (scientific journal)
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Residual effects of compacted digested effluent on growth of dwarf napier grass in warm regions of Japan. Reviewed
Hadijah Hasyim, Yasuyuki Ishii, Ahmad Wadi, Ambo Ako Sunusi, Satoru Fukagawa and Sachiko Idota
Journal of Experimental Biology and Agricultural Sciences 4 ( 1 ) 74 - 84 2016.2
Language：English Publishing type：Research paper (scientific journal)
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Yang Y., Ishii Y., Idota S.
American Journal of Agricultural and Biological Science 11 ( 1 ) 19 - 28 2016.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：American Journal of Agricultural and Biological Science
© 2016 Yingkui Yang, Yasuyuki Ishii and Sachiko Idota.Reduction of feeding cost for the beef and dairy cow industry is an urgent matter requiring the intensification of summer and winter forage cropping in Kyushu, Japan. Forage maize is a prominent high-yield summer crop in the region, where it used to be sown from late March to early August. Due to global warming, maize cropping in the common hot summer now easily suffers from heavy rain and typhoons and this contrasts with the need of expanding the growth periods suitable for maize cropping. This study tested the cropping of triple (spring, summer and autumn) maize crops with winter barley to determine its suitability to be cultivated in the region. Winter barley, sown into inter-rows of the previous row crops in mid-November, was harvested from late February to late March, when spring maize was sown earlier than the current season, after the danger of late frost has passed. Summer maize was sown from early June to early July and autumn maize which was sown from late August to mid-September was harvested in mid-to late November. Winter barley yielded 900-1090 g dry matter (DM)/m2 with 22% ear DM. Early-planted spring maize which was sown in early March yielded 1600-1880 g DM/m2 with 16-28% ear DM and summer maize yielded 900-1280 g DM/m2 with 19-39% ear DM. However, the autumn maize yield varied from 130-300 g DM/m2 without seed maturation to 740-880 g DM/m2 with 51-54% ear DM due to typhoon and cool weather damage. Therefore, triple maize with winter barley cropping can produce a yield of more than 4000 g DM/m2, especially from 2600 g DM/m2 from winter barley and spring maize crops sown in early March, leading to the conclusion that spring maize sown in early March can be harvested without high risk from weather disasters in the region (290 words ≤ 300 words, upper-limit).
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Year-Round Forage Yield Stability through a System Combining Triple-Maize Crops with Winter Barley in Kyushu, Japan. Reviewed
Yingkui Yang, Yasuyuki Ishii, Sachiko Idota
American Journal of Agricultural and Biological Sciences 2016.1
Language：English Publishing type：Research paper (scientific journal)
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Ishii Y., Yamano A., Idota S.
International Journal of Agronomy 2016 2016
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：International Journal of Agronomy
© 2016 Yasuyuki Ishii et al.The effects of short-day (SD) and gibberellic acid (GA3) treatments on promoting vegetative propagation during the summer were examined in Napier grass (Pennisetum purpureum Schumach). A dwarf variety of late heading type (DL) Napier grass was exposed to three SD treatments (5, 10, and 20 short days plus a spray of 400 ppm GA3 solution following each SD treatment, GASD) or no treatment (control). Additionally, then, a dwarf variety of early heading (DE) and the normal variety of Merkeron (ME) were exposed to 10 days of GA-SD treatment together with nontreated controls. For DL and DE, GA-SD treatments showed the following effects: 10-day GA-SD treatment increased significantly (P < 0.05) the length of lateral tiller buds, maintained a high rooting percentage, and increased the diameter of the tiller buds. This resulted in a taller plant, one with enhanced tiller numbers, and thus a greater number of established nursery plants for the two dwarf varieties. In contrast, there was only a limited positive effect of the GA-SD treatments on the normal variety, ME. Thus, 10 days of GA-SD treatment was judged to be the most effective treatment for promoting lateral tiller bud elongation and early maturation in tiller buds for the two dwarf varieties of Napier grass.
DOI： 10.1155/2016/9606914
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Utamy R., Ishii Y., Idota S., Khairani L., Khairani L., Fukuyama K.
Journal of Agriculture and Rural Development in the Tropics and Subtropics 117 ( 1 ) 11 - 19 2016
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Agriculture and Rural Development in the Tropics and Subtropics
© 2016, Kassel University Press GmbH. All rights reserved.Since dwarf napiergrass (Pennisetum purpureum Schumach.) must be propagated vegetatively due to lack of viable seeds, root splitting and stem cuttings are generally used to obtain true-to-type plant populations. These ordinary methods are laborious and costly, and are the greatest barriers for expanding the cultivation area of this crop. The objectives of this research were to develop nursery production of dwarf napiergrass in cell trays and to compare the efficiency of mechanical versus manual methods for cell-tray propagation and field transplanting. After defoliation of herbage either by a sickle (manually) or hand-mowing machine, every potential aerial tiller bud was cut to a single one for transplanting into cell trays as stem cuttings and placed in a glasshouse over winter. The following June, nursery plants were trimmed to a 25-cm length and transplanted in an experimental field (sandy soil) with 20,000 plants ha−1 either by shovel (manually) or Welsh onion planter. Labour time was recorded for each process. The manual defoliation of plants required 44 % more labour time for preparing the stem cuttings (0.73 person-min. stemcutting−1) compared to using hand-mowing machinery (0.51 person-min. stem-cutting −1). In contrast, labour time for transplanting required an extra 0.30 person-min. m−2 (14 %) using the machinery compared to manual transplanting, possibly due to the limited plot size for machinery operation. The transplanting method had no significant effect on plant establishment or plant growth, except for herbage yield 110 days after planting. Defoliation of herbage by machinery, production using a cell-tray nursery and mechanical transplanting reduced the labour intensity of dwarf napiergrass propagation.
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Ishii Y., Ishii Y., Iki Y., Inoue K., Nagata S., Idota S., Yokota M., Nishiwaki A.
Scientifica 2016 2016
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Scientifica
© 2016 Yasuyuki Ishii et al.After the infection of foot-and-mouth disease outbreaks in Miyazaki, Japan, in 2010, cattle and swine were slaughtered and buried in a site of 100 ha, where weed control is difficult and costly since lands are unlevelled and prohibited to be plowed for 3 years. To consider the adaptability of napiergrass (Pennisetum purpureum Schumach.) to the animal burial site for weed control, two napiergrass varieties, normal Wruk wona (WK) and dwarf late-heading variety (DL), were transplanted, compared with sowing of maize (MZ) and sorghum (SR) in both burial (BU) and neighboring bordered area (BO) in mid-June 2011. Even though several weed control methods were subjected to lands, MZ and SR failed to be established stably at only 1/3-1/2 due to the suppression of growth by indigenous weeds, while WK and DL successfully established as high as 82-91% and 73-85%, respectively, in 2011. The poor establishment of MZ and SR after sowing tended to be increased with the year from establishment. Plant dry matter yield and cellulose concentration were the highest in WK in 2011, while overwintering ability was constantly higher in DL in the 3 years. It is necessary to consider the utilization of forage plants on the animal burial site.
DOI： 10.1155/2016/6532160
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Cadmium Phytoremediation Potential of Napiergrass Cultivated in Kyushu, Japan. Reviewed
Yasuyuki Ishii, Kotomi Hamano, Dong-Jin Kang, Sachiko Idota, and Aya Nishiwaki
Applied and Environmental Soil Science 1 - 6 2015.12
Language：English Publishing type：Research paper (scientific journal)
DOI： 10.1155/2015/756270
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Composting characteristics of bovine manure produced by conventional stacked processing and an experimental small-scale apparatus. Reviewed
Yusuke Kajiya, Yasuyuki Ishii, Kiichi Fukuyama, Sachiko Idota
Proceedings of the 23nd International Grassland Congress, New Delhi, India, (2015) 2015.11
Language：English Publishing type：Research paper (international conference proceedings)
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Idota, S., Ishii, Y. and Fukuyama, K.
Agricultural Sciences 6 1003 - 1013 2015.9
Language：English Publishing type：Research paper (scientific journal)
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Precise optimization of poultry manure composting using an experimental small-scale apparatus
Kajiya Y., Ishii Y., Fukuyama K., Idota S.
Journal of Biological Sciences 15 ( 1 ) 40 - 44 2015.8
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Journal of Biological Sciences
© 2015 Asian Network for Scientific Information.Ordinary stacked composting from bovine and poultry manures requires large amounts of materials and it is difficult to conduct uniform and repeated processing. While precise optimization using bovine manure and an experimental small-scale apparatus (Kaguyahime) has already been accomplished, poultry manure has readily decomposable components compared to bovine manure. The objective of this study was to determine the precise optimization of poultry manure composting using the same small-scale apparatus, filled with 7 kg of manure that was dried under sunlight and different amounts of sawdust as subsidiary material. In the preliminary experiment, the maximum temperature for the first 7 days of composting reached over 60°C when the moisture content of the mixture decreased below 65%, while the manure-to-sawdust ratio negligibly affected the temperature increase. Under the preliminary conditions, the maximum temperature of poultry manure mixed with sawdust was over 70°C within 2 days after composting and the thermophile phase above 60 and 55°C continued for an additional 27 and 18 h, respectively. The pH and electrical conductivity of poultry manure composted for 32 days remained at 9.1 and 6.6 mS cm<sup>-1,</sup> respectively, which indicates the manure is safe for land application.
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Precise Optimization of Poultry Manure Composting Using an Experimental Reviewed
Yusuke Kajiya, Yasuyuki Ishii, Kiichi Fukuyama, Sachiko Idota
Journal of Biological Sciences 2015.5
Language：English Publishing type：Research paper (scientific journal)
DOI： 10.3923/jbs.2015.
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Development of mechanical methods for cell-tray propagation and field transplanting of dwarf napiergrass (Pennisetum purpureum Schumach.) Reviewed
Renny Fatmyah Utamy, Yasuyuki Ishii, Sachiko Idota, Lizah Khairani, Kiichi Fukuyama
Journal of Agriculture and Rural Development in the Tropics and Subtropics 117 ( 1 ) 11 - 19 2015.1
Language：English Publishing type：Research paper (scientific journal)
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Ishii Yasuyuki, Iwamura Koji, Obata Hisashi, Tateyama Matsuo, Suzaki Tetsuya, Arima Norio, Kurogi Hisashi, Idota Sachiko
Jpn J Grassl Sci 61 ( 1 ) 27 - 30 2015
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
DOI： 10.14941/grass.61.27
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Effect of Dehydrated Digested Effluentof Manure on Yield and Quality of Annual Forages and Soil Chemical Properties in Southern Kyushu, Japan Reviewed
Sachiko Idota, Yasuyuki Ishii
Agricultural Sciences 2014 ( 5 ) 843 - 849 2014.8
Language：English Publishing type：Research paper (scientific journal)
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Precise optimiz ation of Cattle Manure Composting Using an Experimental Small-Scale Instrument Reviewed
Yusuke Kajiya, Yasuyuki Ishii, Kiichi Fukuyama and Sachiko Idota
Journal of Biological Science 1 - 5 2014.3
Language：English Publishing type：Research paper (scientific journal)
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Sachiko Idota, Jiahua Yang, Manabu Tobisa, Xiaoqin Li, Guomei Li, Rende Song, Haizhu Li, Nobumi Hasegawa, Masahiro Tasumi, Naoyuki Yamamoto, Aya Nishiwaki and Yasuyuki Ishii
Journal of Biological Science 1 - 6 2014.3
Language：English Publishing type：Research paper (scientific journal)
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Effect of digested effluent of manure on soil nutrient content and production of dwarf Napier grass in southern Kyushu, Japan Reviewed
Hadijah Hasyim, Yasuyuki Ishii, Ahmad Wadi, Sachiko Idota
Journal of Agronomy 1 - 11 2014.1
Language：English Publishing type：Research paper (scientific journal)
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YANG Jiahua, IDOTA Sachiko, TOBISA Manabu, LI Guomei, SONG Rende, LI Xiaoqin, LI Haizhu, TASUMI Masahiro, HASEGAWA Nobumi
Nihon Souchi Gakkai Kyushu Shibukaiho 57 ( 2 ) 105 - 113 2014
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Warm Regional Society of Animal Science, Japan
In the alpine grazing rangeland of the Tibetan Plateau, where three major rivers originate in China, ten sites (Plot 1 to10, 20 m × 20 m each) were selected in the habitats of plateau pikas (Ochotona curzoniae) in August 2012 for investigatingthe relationship among population density of pleateau pikas, vegetation and soil physical and chemical properties. Thepopulation density was estimated by counting the active (opened) burrows with a filling-burrow method after counting thenumber of burrow openings in each plot. A vegetational survey was conducted with quadrat methods in those plots. Soilsamples were collected from 0 to 5 cm depth and physical and chemical properties were determined. The burrow openingdensity (BD) ranged from 0 to 133/400 m2 and the available burrow opening density (ABD) ranged from 5 to 63/400 m2except 0 in Plot 1, 2 and 3. BD was negatively correlated with plant height (r = -0.652, P < 0.05) and tended to be donewith coverage (r = -0.600, P < 0.1) in vegetation and positively with bulk density (r = 0.607, P < 0.1) and negatively withSO42- content (r = -0.572, P < 0.1) in soil. ABD tended to be correlated with plant height (r = -0.562, P < 0.1) and bulkdensity (r = 0.593, P < 0.1). Generalized liner model analyses showed that BD and ABD were affected positively by soilhardness and TN and negatively by plant height (P < 0.001). BD only was negatively affected by TC in soil (P < 0.001).With cation and anion contents in soil, BD and ABD were negatively affected by Ca2+, NH4+ and SO42- (P < 0.001), and alsoonly BD was affected by Mg2+ (P < 0.001). It was suggested that the increase of population density of plateau pikas mightbe related with the lowered plant height, increases of soil hardness and the TN content and decrease of the TC contentwhere domestic herbivores have grazed intensively.
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YANG Jiahua, IDOTA Sachiko, LI Guomei, SONG Rende, GUO Zhihong, LI Xiaoqin, LI Haizhu, TOBISA Manabu, TASUMI Masahiro, FUKUDA Akira, NISHIWAKI Aya, KASHIMURA Atsushi, SAKAMOTO Shinsuke H., MORITA Tetsuo, HASEGAWA Nobumi
Nihon Souchi Gakkai Kyushu Shibukaiho 57 ( 1 ) 37 - 47 2014
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Warm Regional Society of Animal Science, Japan
In the alpine grazing rangeland of the Tibetan Plateau, where three major rivers originate in China, four sites (Plot I to IV, 50 m × 50 m each) in 2011, and ten sites (Plot 1 to 10, 20 m × 20 m each) in 2012 in the habitats of plateau pikas (Ochotona curzoniae) were selected in order to investigate the relationship between the highly varied individual density of pleateau pikas and vegetation. The individual density was roughly estimated by counting the active burrow openings with a filling-burrow opening method. A vegetation survey was conducted with one or both quadrat and line transect methods in those plots. The active burrow opening density was significantly correlated with the burrow opening density (r = 0.996, P < 0.01). The active opening density differed significantly among the plots (P < 0.001), and that in Plot I was smallest (4/2,500 m2/day). The density in Plot IV (305/2,500 m2/day) was greatest in 2011, and ranged from zeroes in Plots 1, 2 and 3 to 63/400 m2/day in Plot 10 in 2012. Indices for floristic diversity in Plot I were highest and in Plot II were lowest in 2011, and in Plot 3 were highest and in Plot 4 were lowest in 2012. Generalized liner model analyses showed that the burrow opening density was affected positively by vegetation cover and number of plant species, and negatively by aboveground biomass and plant height, and that the active burrow opening density was affected positively by vegetation cover and number of plant species, and negatively by plant height. These results suggested that plateau pikas would select sites with comparatively higher vegetation cover as their habitats from sites with lower plant height and lower vegetation cover where domestic animals have grazed.
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原材料の異なる牛糞堆肥の無機化特性と暖地型牧草カラードギニアグラスへの施肥効果 Reviewed
梶谷祐介，井戸田幸子，石井康之，福山喜一
日本暖地畜産学会報 56 ( 2 ) 143 - 150 2013.10
Language：Japanese Publishing type：Research paper (scientific journal)
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Adaptability and extension activity of dwarf napiergrass in southern Kyushu and elsewhere since its introduction to Japan 15 years ago. Reviewed
Yasuyuki Ishii, Dong-Jin Kang, Asuka Yamano, Sachiko Idota, and Kiichi Fukuyama
Proceedings of the 22nd International Grassland Congress 293 - 296 2013.9
Language：English Publishing type：Research paper (international conference proceedings)
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Change of behavior of Bos grunniens in the alpine rangeland in the eastern Tibetan Plateau. Reviewed
Nobumi Hasegawa, Rende Song, Guomei Li, Xumin Cao, Masahiro Tasumi, Sachiko Idota and Akira Fukuda
Proceedings of the 22nd International Grassland Congress 1177 - 1178 2013.9
Language：English Publishing type：Research paper (international conference proceedings)
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Relationship between soil chemical and physical properties and vegetation in the latest decade of alpine grasslands of southern Qinghai, China. Reviewed
Sachiko Idota，Jiahua Yang, Manabu Tobisa, Xiaoqin Li, Guomei Li, Rende Song, Haizhu Li, Nobumi Hasegawa, Masahiro Tasumi, Naoyuki Yamamoto, Aya Nishiwaki and Yasuyuki Ishii
Proceedings of the 22nd International Grassland Congress 1421 - 1422 2013.9
Language：English Publishing type：Research paper (international conference proceedings)
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An ecological monitoring of the plateau pika and its impact on grassland – An experiment in the Yushu District, Qinghai Province of China. Reviewed
Masahiro Tasumi, Nobumi Hasegawa, Akira Fukuda, Rende Song, Guomei Li, Jiahua Yang, Manabu Tobisa and Sachiko Idota
Proceedings of the 22nd International Grassland Congress 1629 - 1630 2013.9
Language：English Publishing type：Research paper (international conference proceedings)
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Management options that increase herbage production in grassland-based livestock production systems. Invited Reviewed
Masahiko Hirata, Manabu Tobisa and Sachiko Idota
Proceedings of the 22nd International Grassland Congress 462 - 468 2013.9
Language：English Publishing type：Research paper (international conference proceedings)
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C4-Napier Grass Cultivation for Cadmium Phytoremediation Activity and Organic Livestock Farming in Kyushu, Japan Reviewed
Yasuyuki Ishii, Kotomi Hamano, Dong Jin Kang, Rengsinkul Kannika, Sachiko Idota, Kiichi Fukuyama, Aya Nishiwaki
Journal of Agricultural Science and Technology A ( 3 ) 321 - 330 2013.6
Language：English Publishing type：Research paper (scientific journal)
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Variation in Growth Attributes, Dry Matter Yield and Quality Among 6 Genotypes of Napier Grass used for Biomass in Year of Establishment in Southern Kyusyu, Japan Reviewed
Lizah Khairani, Yasuyuki Ishii, Sachiko Idota, Renny Fatmyah Utamy, Aya Nishiwaki
Asian Journal of Agricultural Research 7 ( 1 ) 15 - 25 2013.6
Language：English Publishing type：Research paper (scientific journal)
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Khairani L., Khairani L., Ishii Y., Idota S., Utamy R., Nishiwaki A.
Asian Journal of Agricultural Research 7 ( 1 ) 15 - 25 2013.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Asian Journal of Agricultural Research
As for estimating the suitability of napier grass for biomass use in southern Kyushu, Japan, the objective of this study was to determine the most suitable genotype of napier grass for dry matter production and quality (fiber content) for biomass ethanol conversion in the year the plants were established. Six genotypes of napier grass, a dwarf early-heading type, a dwarf late-heading type, a hybrid of pearl millet with napier grass, a purple-foliage type and normal varieties of Merkeron and Wruk wona, were examined for growth attributes, dry matter yield, chemical composition and in vitro Dry Matter Digestibility (IVDMD) at the University of Miyazaki in southern Kyushu, Japan in 2009. Dry matter yield ranged from 13.4 to 33.5 Mg ha-1, with the highest yielder being normal Wruk wona, followed by Merkeron. Hemicellulose and cellulose content of both Leaf Blade (LB) and stem inclusive of leaf sheath (ST) did not differ significantly among genotypes, except for cellulose content in ST which was significantly higher for the dwarf early-heading type than for the other genotypes. The dwarf late-heading type had significantly higher IVDMD in ST (65.8%) due to lower acid detergent lignin and cellulose content in ST than the other genotypes. Based on dry matter production, fiber (carbohydrate) content in the current study and theoretical conversion efficiency from cellulose and hemicelluloses of 0.29 and 0.23, respectively, Merkeron appears the most promising genotype for biomass production, with theoretical ethanol production potential of 5850 L ha-1 year-1 in the year of establishment. © Knowledgia Review, Malaysia.
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IDOTA S., ASANO Y., KIRIMURA M., SUGIMOTO Y., ISHII Y.
Journal of Japanese Society of Grassland Science 58 ( 4 ) 230 - 240 2013.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
A 2-year field experiment was conducted to examine the fertilizing effect of digested effluent of manure (DEM) on growth attributes, dry matter yield, forage quality and nitrogen (N) recovery rate of maize (Zea mays L.)-Italian ryegrass (Lolium multiflorum Lam.) cropping system, compared with application of conventional fertilizer (commercial cattle manure and chemical fertilizer) and sole chemical fertilizer. The DEM solution was applied at three levels : 40, 70 and 100 gN/m^2/year for low, medium and high levels, respectively. The N application level in the chemical and conventional fertilizer treatment were 40 and 69.2 g N/m^2/year, respectively, which were similar to and the same as in the low and medium levels of DEM, respectively. The effect of DEM on growth attributes, yield, forage quality and nitrogen recovery rate of each cropping and total of this cropping system was almost corresponded with that of the chemical fertilizer at the same N application rate. This suggests that DEM can be used in short-term as substitution of fastly effective chemical fertilizer and optimum application rate of DEM should be below 40 gN/m^2/year in the maize-Italian ryegrass cropping system in southern Kyushu.
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IDOTA Sachiko, TOBISA Manabu, UEMURA Ryoko, HORII Yoichiro, SUEYOSHI Masuo, ISHII Yasuyuki, NISHIWAKI Aya, YAMAMOTO Naoyuki
Journal of Japanese Society of Grassland Science 58 ( 4 ) 277 - 279 2013.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
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Forage Use as Remediation on Burial Sites of Foot-and-Mouth Disease Infection
NISHIWAKI Aya, ISHII Yasuyuki, IDOTA Sachiko, YOKOTA Masato
Journal of Japanese Society of Grassland Science 58 ( 4 ) 266 - 268 2013.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
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メタン発酵消化液の施用が南九州におけるトウモロコシ－イタリアンライグラス体系の収量性と飼料品質に及ぼす影響． Reviewed
井戸田幸子, 浅野陽樹,霧村雅昭,杉本安寛,石井康之
日本草地学会誌 58 ( 4 ) 230 - 240 2013.1
Language：Japanese Publishing type：Research paper (scientific journal)
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KAJIYA Yusuke, IDOTA Sachiko, ISHII Yasuyuki, FUKUYAMA Kiichi
Nihon Souchi Gakkai Kyushu Shibukaiho 56 ( 2 ) 143 - 150 2013
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Warm Regional Society of Animal Science, Japan
Since Kyushu is the base of beef cattle industry in Japan, livestock wastes needs to be treated effectively as an organic fertilizer replacing inorganic or chemical fertilizers in forage production. However, little is known about the differences in mineralization characteristics and fertilizing efficiency between farmyard manures derived from cattle with different feeding systems. Thus, effects of farmyard manures derived from fattening beef cattle with co-digestion substrates of sawdust (abbreviated as F+SM) and breeding beef cattle under the feeding of sawdust (B+SM) or grazing on bahiagrass with the substrate of sawdust (B+BSM) or rhodesgrass (B+BRM) were examined for herbage yield, nitrogen content and soil chemical properties in tropical colored guineagrass. Even though the F+SM had lowest total nitrogen (TN) content with highest carbon/nitrogen (C/N) ratio, herbage dry matter yield (DMY), crude protein (CP) content and chlorophyll content in colored guineagrass were highest in the F+SM, on the contrary to the B+BRM which had highest TN content with lowest C/N ratio, leading to the lowest herbage DMY and CP content. Nitrogen mineralization characteristics of farmyard manure determined by an incubation method showed the highest efficiency from F+SM, followed by B+BSM, B+SM and lowest from B+BRM, which lead to an resolution for the contradiction between chemical properties of farmyard manure and the grass growth. Soil chemical properties such as pH and TN content did not vary so much and were hardly correlated with these herbage yield and TN content. It is proposed that the characteristics and fertilizing efficiency of beef cattle farmyard manures should be variable depending on beef cattle feeding systems and co-digestion substrates, and the F+SM had highest fertilizing efficiency on the grass growth among farmyard manures examined.
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MORI Koutarou, ISHII Yasuyuki, YAMANO Asuka, HAMANO Kotomi, NAKAHARA Tomoaki, IDOTA Sachiko
Journal of Japanese Society of Grassland Science 58 ( 2 ) 83 - 89 2012.7
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
In order to improve growth and seasonal productivity of bahiagrass (Paspalum notatum Flugge) during the low temperature season in southern Kyushu, growth attributes, forage yield and quality of a new genotype, "Tifton 9", which was bred in and introduced from the United States, was compared to current genotypes, "Pensacola" and "Nanou", for 4 years after the year of establishment. Observation and cutting of herbage were conducted every month in the second and third years and every 2months in the fourth and fifth years. "Tifton 9" showed superior growth and yielding ability during the low temperature season, resulting in stabilization of seasonal productivity and improvement of annual dry matter (DM) yield cut every month in the second and third years. In vitro DM digestibility (IVDMD) as forage quality did not differ among three genotypes and correlated negatively (P<0.05) with DM yield for both 1- and 2-month intervals. Other quality attributes did not differ among genotypes. The average values for IVDMD and concentrations of crude protein, neutral detergent fiber, acid detergent fiber and acid detergent lignin in "Tifton 9" across whole cuttings in the fifth year were 49.4, 6.5, 70.5, 42.1 and 6.7%, respectively. Respective forage quality of "Tifton 9" is equivalent to a standard value among common tropical grasses.
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バヒアグラス（Paspalum notatum Flűgge）新品種「Tifton 9」の導入による季節生産性および低温伸長性の改善． Reviewed
森 康太郎，石井康之，山野明日香，濵野琴美，中原智晃，井戸田幸子
日本草地学会誌 58 ( 2 ) 83 - 89 2012.7
Language：Japanese Publishing type：Research paper (scientific journal)
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YAMANO Asuka, ISHII Yasuyuki, MORI Koutarou, HAMANO Kotomi, NAKAHARA Tomoaki, IDOTA Sachiko
Report of the Kyushu Branch of the Crop Science Society of Japan ( 78 ) 25 - 28 2012.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Crop Science Society of Japan
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ネピアグラスの効率的栄養苗生産に向けた品種・時期別苗生産の特徴と剪葉処理の効果（共著）
山野明日香，石井康之，森 康太郎，濱野琴美，中原智晃，井戸田幸子
日本作物学会九州支部会報 78 25 - 28 2012.5
Language：Japanese Publishing type：Research paper (scientific journal)
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ネピアグラス(Pennisetum purpureum Schumach)のカドミウム集積能力の推定およびカドミウム汚染土壌の浄化に向けた乾燥技術（共著）
濱野琴美，石井康之，山野明日香，森 康太郎，井戸田幸子，姜 東鎮，西脇亜也
日本作物学会九州支部会報 78 21 - 24 2012.5
Language：Japanese Publishing type：Research paper (scientific journal)
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Effect of weed control Management on Herbage Yield, Quality and Wintering Ability in the Established Dwarf Napiergrass (Pennisetum purpureum Schumach)."Jointly worked" Reviewed
Renny Fatmyah UTAMY, Yasuyuki ISHII, Sachiko IDOTA, Lizah KHAIRANI
日本暖地畜産学会 55 ( 1 ) 17 - 26 2012.4
Language：English Publishing type：Research paper (scientific journal)
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Comparison of 6 genotyopes napiergrass foggage grown in southern Kyushu, Japan for biomass use."Jointly worked" Reviewed
Lizah Khairani, Yasuyuki Ishii, Sachiko Idota, Renny Fatmyah Utamy, Aya Nishiwaki
Proceedings of the 4th Japan-China-Korea Grassland Conference 156 - 157 2012.3
Language：English Publishing type：Research paper (international conference proceedings)
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Effect of mother plant density on growth and efficiency of nursery production in dwarf napiergrass (Pennisetum purpureum Schumach) for 2 years after establishment."Jointly worked" Reviewed
Asuka Yamano, Yasuyuki Ishii, Koutarou Mori, Kotomi Hamano, Tomoaki Nakahara, Sachiko Idota
Proceedings of the 4th Japan-China-Korea Grassland Conference 154 - 155 2012.3
Language：English Publishing type：Research paper (international conference proceedings)
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Effects of shoot age and botanical fraction on structural carbohydrates in three varieties of napiergrass (Penisetum purpureum Schumach)"Jointly worked" Reviewed
Tomoaki Nakahara, Yasuyuki Ishii, Lizah Khairani, Koutarou Mori, Asuka Yamano, Kotomi Hamano, Sachiko Idota, Aya Nishiwaki
Proceedings of the 4th Japan-China-Korea Grassland Conference 152 - 153 2012.3
Language：English Publishing type：Research paper (international conference proceedings)
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Effect of mixed sowing of annual Setaria and Digitaria species on establishment of bahiagrass in southern Kyushu"Jointed worked" Reviewed
Koutarou Mori, Yasuyuki Ishii, Asuka Yamano, Kotomi Hamano, Tomoaki Nakahara, Sachiko Idota
Proceedings of the 4th Japan-China-Korea Grassland Conference 150 - 151 2012.3
Language：English Publishing type：Research paper (international conference proceedings)
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Yield and nitrogen recovery rate in two forage cropping systems supplied with organic fertilizers originating from digested effluent of manure"Jountly worked"
Sachiko Idota, Yoki Asano, Masaaki Kirimura, Yasuhiro Sugimoto, Yasuyuki Ishii
Proceedings of the 4th Japan-China-Korea Grassland Conference 148 - 149 2012.3
Language：English Publishing type：Research paper (international conference proceedings)
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Assessment of potential cadmium uptake for phytoextraction activity in solution cultures of napiergrass."jointly worked" Reviewed
Kotomi Hamano, Yasuyuki Ishii, Dong-Jin Kang, Asuka Yamano, Koutarou Mori, Sachiko Idota, Aya Nishiwaki
Proceedings of the 4th Japan-China-Korea Grassland Conference 62 - 63 2012.3
Language：English Publishing type：Research paper (international conference proceedings)
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Yield and nitrogen recovery rate in two forage cropping systems supplied with organic fertilizers originating from digested effluent of manure"Jountly worked". Reviewed
Sachiko Idota, Yoki Asano, Masaaki Kirimura, Yasuhiro Sugimoto, Yasuyuki Ishii
Proceedings of the 4th Japan-China-Korea Grassland Conference 148 - 149 2012.3
Language：English Publishing type：Research paper (international conference proceedings)
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雑草防除管理が造成した矮性ネピアグラスの粗飼料の収量，品質および越冬性に及ぼす影響
UTAMY Renny Fatmyah, 石井 康之, 井戸田 幸子, KHAIRANI Lizah
日本暖地畜産学会報 55 ( 1 ) 17 - 26 2012
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Warm Regional Society of Animal Science, Japan
ネピアグラスの矮性晩生品種（DLネピアグラス）を南九州の生産者へ普及する過程で，造成年における雑草防除が本牧草の良好な定着と粗飼料収量を確保する重要な要因であることが明らかとなった．本研究は，3種類の雑草防除管理，すなわち節間伸長茎では再生能力を欠く一年生セタリアの混播，ペーパーマルチの設置および手取り除草と雑草防除なしについて，乾物収量，粗飼料品質および越冬性を2カ年（2008～2009年および2010～2011年）にわたって検討した．いずれの雑草防除管理も雑草防除なしと比べて，草高，茎数密度，葉身比率および葉面積指数などの植物体の各形質に有意な正の効果をもたらした．特に，ペーパーマルチの設置は，両年ともに最も高い収量が得られ，2008～2009年では越冬率が最も高く100%であった．一年生セタリアの混播は，雑草によるDLネピアグラスの収量減を部分的に補完する効果があった．粗飼料品質としての<i>in vitro</i>乾物消化率（IVDMD）と粗タンパク質（CP）含量に対する雑草防除の効果は認められなかった．したがって，ペーパーマルチの設置と一年生セタリアの混播はともに，造成したDLネピアグラスの収量性を確保するため，また越冬性改善の可能性のある有効な雑草防除手法として提起できるものと推察された．
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Utamy Renny Fatmyah, Ishii Yasuyuki, Khairani Lizah, Mori Koutarou, Idota Sachiko
Abstracts of Meeting of the CSSJ 234 ( 0 ) 2012
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：CROP SCIENCE SOCIETY OF JAPAN
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Hamano Kotomi, Ishii Yasuyuki, Idota Sachiko, Nakahara Tomoaki, Nishiwaki Aya, Kang Dong-Jin
Abstracts of Meeting of the CSSJ 234 ( 0 ) 2012
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：CROP SCIENCE SOCIETY OF JAPAN
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YAMANO Asuka, ISHII Yasuyuki, MORI Koutarou, HAMANO Kotomi, IDOTA Sachiko
80 76 - 77 2011.8
Language：Japanese Publishing type：Research paper (scientific journal)
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HAMANO Kotomi, ISHII Yasuyuki, YAMANO Asuka, MORI Koutarou, IDOTA Sachiko, KANG Dong-Jin, NISHIWAKI Aya
Report of the Kyushu Branch of the Crop Science Society of Japan ( 78 ) 21 - 24 2011.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Crop Science Society of Japan
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YAMANO Asuka, ISHII Yasuyuki, KHAIRANI Lizah, IDOTA Sachiko
Report of the Kyushu Branch of the Crop Science Society of Japan ( 77 ) 63 - 67 2011.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：The Crop Science Society of Japan
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矮性ネピアグラスの栄養苗生産のための成長形質に及ぼす短日およびジベレリン処理の影響（共著）
山野 明日香, 石井 康之, Lizah Khairani, 井戸田 幸子
日本作物学会九州支部会報 77 63 - 68 2011.5
Language：Japanese Publishing type：Research paper (scientific journal)
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Adaptability of Dwarf Napiergrass under Cut-and carry and Grazing systems for Smallholder Beef Farmers in Southern Kyushu, Japan (共著） Reviewed
Renny Fatmyah UTAMY, Yasukyuki ISHII, Sachiko IDOTA, Naoto HARADA and Kiichi FUKUYAMA
日本暖地畜産学会報 54 ( 1 ) 87 - 98 2011.3
Language：English Publishing type：Research paper (scientific journal)
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UTAMY Renny Fatmyah, ISHII Yasuyuki, IDOTA Sachiko, HARADA Naoto, FUKUYAMA Kiichi
Nihon Souchi Gakkai Kyushu Shibukaiho 54 ( 1 ) 87 - 98 2011
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Warm Regional Society of Animal Science, Japan
Smallholder beef farmers, particularly in isolated islands, were highly aged, holding limited arable lands with poor machinery equipment. Demand for herbage production increases rapidly due to high cost of imported herbage supply. We investigated the adaptability of dwarf napiergrass (<I>Pennisetum purpureum</I> Schumach) of late-heading type (dwarf-late, DL) to 12 sites including isolated islands in 3 Prefectures of southern Kyushu by determining soil properties, plant growth characters, herbage yield and quality, and overwintering ability in 2007.2009. The dry matter (DM) yield of DL napiergrass ranged in 0.7-13.6 and 0.2.15.8 Mg/ha/yr in 2007 and 2008, respectively. There were significantly positive correlations between N fertilizer supply and DM yield (r = 0.844, P < 0.01 and r = 0.928; P < 0.001 in 2007 and 2008, respectively). However, not only by the rate of fertilizer application, DM yield was also variable depending on soil fertility and weed control across the examined sites. Herbage quality in leaf blade and stem inclusive of leaf sheath, as assessed by <I>in vitro</I> DM digestibility and crude protein (CP) content, ranged in 56.76% and 6.18%, respectively. In some cases, CP content declined below the critical level as a feed for breeding cows, since the herbage quality in leaf blade had significantly negative correlation with cutting interval (P < 0.05). Results revealed that DL napiergrass should adapt to the examined sites including isolated islands in the established and subsequent years. However, it is necessary to maintain the satisfactory level of herbage yield and quality by the minimum fertilizer application at least more than 100 kg N/ha/yr, and the optimum soil condition, cutting interval and weed control after establishment.
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Yamano Asuka, Ishii Yasuyuki, Mori Koutarou, Hamano Kotomi, Idota Sachiko
Abstracts of Meeting of the CSSJ 232 ( 0 ) 76 - 76 2011
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：CROP SCIENCE SOCIETY OF JAPAN
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Growth Response of Dwarf Napiergrass to Manure Application Originated from Digested Effluent (共著） Reviewed
Hadijah HASYIM，Yasuyuki ISHII， Ahmad WADI，Sachiko IDOTA and Yasuhiro SUGIMOTO
日本暖地畜産学会報 53 ( 2 ) 115 - 126 2010.9
Language：English Publishing type：Research paper (scientific journal)
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HASEGAWA Nobumi, SONG Rende, LI Guomei, IDOTA Sachiko, NISHIWAKI Aya
Japanese journal of grassland science 56 ( 1 ) 67 - 73 2010.4
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
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Effect of growth rate and sprout promotion on the bivalent iron ions in Japanese lawn grass (Zoysia japonica Stued.). Reviewed
Tomoya Matsuyama, Sachiko Idota, Naoki Horimoto, Tesshu Otabara, Yasuo Nomura, Hirohiko Sasamoto, Ryo Akashi
Journal of Japanese Society of Turfgrass Science 38 ( 2 ) 162 - 166 2010.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Growth Response of Dwarf Napiergrass to Manure Application Originated from Digested Effluent
HASYIM Hadijah, ISHII Yasuyuki, WADI Ahmad, IDOTA Sachiko, SUGIMOTO Yasuhiro
Nihon Danchi Chikusan Gakkaihou 53 ( 2 ) 115 - 126 2010
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Warm Regional Society of Animal Science, Japan
The objectives of this study were to determine the growth response of dwarf napiergrass (<I>Pennisetum purpureum</I> Schumach) to digested effluent of manure (DEM). Liquid form of DEM (LDEM) produced from biogas-plant and different rates of manure enriched with LDEM (SDEM) were applied to dwarf napiergrass. The plant height, tiller number, leaf area and total dry matter weight (TDMW) significantly increased with the increasing manure application in dwarf napiergrass. This yielding ability was derived from high accumulation of dry matter in root and underground stem part to show lower top to root ratio below 2 in this genotype. Both LDEM and SDEM were so effective in enhancing plant growth as in chemical fertilizer, while the efficiency of total N content to yielding ability was the least in SDEM, followed by LDEM and chemical fertilizer with no-significant difference among treatments in dwarf napiergrass.
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Matsuyama Tomoya, Idota Sachiko, Horimoto Naoki, Otabara Tesshu, Nomura Yasuo, Sasamoto Hirohiko, Akashi Ryo
Journal of Japanese Society of Turfgrass Science 38 ( 2 ) 162 - 166 2010
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Turfgrass Science
<p>We investigated that the effect of new iron-supplement fertilizer TetsuRiki (Aichi Steel's company) containing FeO as a main component on the growth and post-dormancy growth of Japanese lawn grass (<i>Zoysia japonica</i> Steud.) under the field conditions. Plants were supplied by ion-supplement application under three levels control (0 kg/m<sup>2</sup>), low (0.17 kg/m<sup>2</sup>), high (0.33 kg/m<sup>2</sup>). Plant height and dry matter weight of shoot were remarkably improved in parallel with the improvement of leaf SPAD value. And the number of budding was increased with adversely effecting post-dormancy recovery in spring. Iron and manganese concentrations in aboveground plant parts were higher in Fe application plots than control plots. However, the number of sprout in Fe application plots was no significant difference between control plots.</p>
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Adaptability and sustainability of DL napiergrass under cut-and-carry and grazing systems for smallholder farmers in southern Kyushu, Japan "jointly worked"
Renny Fatmyah Utamy, Yasuyuki Ishii, Ahmad Wadi, Sachiko Idota, Naoto Harada, Kiichi Fukuyama
Proceedings of the 3rd Korea-China-Japan Jpint Sympossium on Grassland Agriculture and Livestock Production 62 - 63 2009.8
Language：English Publishing type：Research paper (international conference proceedings)
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Establishment of rotational grazing system on dwarf napiergrass pasture oversown with Italian ryegrass by smallholder farmers of Japanese-Black breeding beef cows in southern Kyushu, Japan "jointly worked"
Yasuyuki Ishii, Kiichi Fukuyama, Takanori Iwakiri, Ahmad Wadi, Sachiko Idota
Proceedings of the 3rd Korea-China-Japan Joint Symposium on Grassland Agriculture and Livestock Production 218 - 219 2009.8
Language：English Publishing type：Research paper (international conference proceedings)
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Sustainable and environmentally conservative cropping system of dwarf napiergrass and Italian ryegrass in southern Kyushu, Japan "jointly worked"
Hadijah Hasyim, Yasuyuki Ishii, Sachiko Idota, ahmad Wadi, Yasuhiro Sugimoto
proceedings of the 3rd Korea-China-Japan Joint Sympossium on Grassland Agriculture and Livestock Production 60 - 61 2009.8
Language：English Publishing type：Research paper (international conference proceedings)
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Adaptability of maize-Italian ryegrass cropping to variable sowing dates by life cycle assessment in southern Kyushu, Japan. Reviewed
Y.N. Wang, Y. Ishii, A. Wadi, R.F. Utamy, S. Idota and Y.X. Shen.
Proceedings of the 21st International Grassland Congress 248 2008.8
Language：English Publishing type：Research paper (international conference proceedings)
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Effect of digested effluent of manure on the growth and yield of dwarf napiergrass in southern Kyushu, Japan Reviewed
H. Hasyim, Y. Ishii, A. Wadi, R.F. Utamy, Y. Wang, S. Idota and K. Fukuyama.
Proceedings of the 21st International Grassland Congress 228 2008.8
Language：English Publishing type：Research paper (international conference proceedings)
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Rotational grazing effects of dairy cows on yield and consumption in dwarf napiergrass at a paddok scale for 3 years from establishment in southern Kyushu, Japan"jointly worked" Reviewed
A. Wadi, Y. Ishii, H. Hasyim, R. F. Utamy, S. Idota, K. Fukuyama
Proceeding of XVI International grassland congress, Innner mongolia China 135 - 135 2008.6
Language：English Publishing type：Research paper (international conference proceedings)
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Adaptability of dwarf napiergrass to smallholder farmers of beef cows in southern Kyushu, Japan"jointly worked" Reviewed
Y. Ishii, A. Wadi, R.F. Utamy, Y. Wang, S. Fukagawa, S. Idota, K. Fukuyama
Proceeding of XVI International Grassland Congress, Inner mongolia, China 230 - 230 2008.6
Language：English Publishing type：Research paper (international conference proceedings)
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Yield trends and soil mineral changes in three summer winter forage cropping systems for 5 consecutive years in southern Kyushu, Japan"jointly worked" Reviewed
S. Idota, Y. Ishii
Proceeding of XVI International Grassland Congress 308 - 308 2008.6
Language：English Publishing type：Research paper (international conference proceedings)
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解膠ケイ酸がクリーピングベントグラスの成長と無機養分含量に及ぼす影響 共著 Reviewed
森下史康，井戸田幸子，明石良
宮崎大学農学部研究報告 54 65 - 68 2008.1
Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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Effects of peptized silica application on growth and mineral content in creeping bentgrass
Morishita Fumiyasu, Idota Sachiko, Akashi Ryo
Bulletin of the Faculty of Agriculture, Miyazaki University 54 65 - 68 2008.1
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Miyazaki University
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IDOTA Sachiko, ISHII Yasuyuki
Japanese journal of grassland science 53 ( 2 ) 93 - 101 2007.7
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
Maize (Zea mays L.), sorghum (Sorghum bicolor Moench) and Italian ryegrass (Lolium multiflorum Lam., IR) are major forage crops in southern Kyushu. This study tested 3 cropping systems typical to the region (double cropping of maize and IR (M-IR), double cropping of sorghum and IR (S-IR), and double cropping of maize (M-M)) for 5 years for their performance on the non-fertile, poorly permeable heavy soil. A single cropping of maize on fertile, permeable Andosol (M) was also tested for comparison. Herbage dry matter yields of summer crops (maize and sorghum) were more variable among years (CV=46.0-54.4%) than those of IR as a winter crop (CV=9.5-23.1%), with the low yields being associated with frequent attacks of typhoons and heavy rainfalls. Consequently, in M-IR and S-IR, incorporation of IR into the cropping system decreased the year-to-year variability in herbage yield (31.2 and 48.3%, respectively). Maize on Andosol (M) showed 2-34% higher yields than the 1st-crop maize on the heavy soil (M-M). The results confirm the relatively low productivity of the heavy soil and show the advantage of combining a winter crop with a summer crop for stabilizing annual herbage production on the heavy soil in southern Kyushu.
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Annual Variation in Herbage Dry Matter Yield under Some Forage Cropping Systems on the Heavy Soil in Southern Kyushu."jointly worked" Reviewed
Sachiko Idota, Yasuyuki Ishii
Japanese Journal of Grassland Science 53 ( 2 ) 93 - 101 2007.7
Language：Japanese Publishing type：Research paper (scientific journal)
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Effect of level of manure application on leaf and tiller growth in pot-cultured napiergrass (Pennisetum purpureum Schumach)（共著）
Hadijah Hasyim, Ahmad Wadi, Sachiko Idota, Yasuyuki Ishii
宮崎大学農学部研究報告 53 ( 1・2 ) 59 - 66 2007.3
Language：English Publishing type：Research paper (bulletin of university, research institution)
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チベット高原北部におけるヤク（Bos grunniens）の放牧季節の違いが金露梅（Potentilla fruticosa）優占草地の植物の種多様性と現存量に及ぼす影響. Reviewed
李 国梅，長谷川信美，宋 仁徳，井戸田幸子，王 有良，馮 生青
Animal Behaviour and Management 43 ( 1 ) 1 - 8 2007.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Effect of level of Manure Application on Leaf and Tiller Growth in Pot-cultured Napiergrass "jointly worked" Reviewed
Hasyim Hadijah, Wadi Ahmad, Idota Sachiko, Ishii Yasuyuki
Bullitetin of the Faculty of Agriculture, University of Miyazaki 53 59 - 65 2007.3
Language：English Publishing type：Research paper (bulletin of university, research institution)
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堆肥の施用量がポット栽培したネピアグラス(Pennisetum purpureum Schumach)の葉と分げつの成長に及ぼす影響
Hasym Hadijah, Wadi Ahmad, 井戸田 幸子, 石井 康之
宮崎大学農学部研究報告 53 ( 1 ) 59 - 65 2007.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：宮崎大学
ネピアグラスの成長に及ぼす堆肥から無機化した養分量の影響を検討するため、異なる堆肥施用量の下でポット栽培したネピアグラスの分げつと葉の成長および個体当りの成長形質を測定した。堆肥施用量の増加に伴い、葉の成長は主として茎当りの総展開葉数および分げつ数の増加により促進された。分げつ数および平均分げつ重は、堆肥施用量が中程度（4kg／m2）のレベルまで増加するにつれて増加した。植物体内の乾物分配については、茎（葉鞘を含む）に対する葉身の比率や地下部に対する地上部の比率は生育に伴い低下したが、堆肥施用量の影響はほとんど認められなかった。堆肥施用量の増加により葉と茎の成長が促進され、それが葉面積指数（LAI）の増加をもたらし、さらに個体群成長速度（CGR）の増加をもたらした。CGRはLAIとの間に、全LAIを通して正の直線関係が成り立った。堆肥施用により、高温の盛夏期間にCGRが最も高くなったのは、広範囲のLAIの下で純同化率がほぼ一定であったことによっており、盛夏期間に堆肥からの無機化速度が高まったことが示唆された。
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不良土壌で栽培される飼料作物の乾物生産と無機養分収支 Reviewed
井戸田幸子
2007.1
Language：Japanese Publishing type：Doctoral thesis
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Li Guomei, HASEGAWA Nobumi, SONG Rende, IDOTA Sachiko, WANG Youliang, FENG Shengqing
Animal Behaviour and Management 43 ( 1 ) 1 - 8 2007
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Soceity of Livestock Management
Effect of rotational grazing of yak in two (warm and cold) seasons for over 20 years on species diversity and biomass of plants was investigated in Potentilla fruticosa rangeland in northern Qinghai-Tibetan Plateau. In the paddock grazed in warm seasons (WSP), 37 species (Gramineae : Cyperaceae : forbs : shrubs = 6 : 5 : 23 : 3) appeared and 44 (Gramineae : Cyperaceae : forbs : shrubs=7 : 6 : 27 : 4) did in that grazed in cold seasons (CSP). WSP was smaller in values of Richness, Shannon-Wiener, Simpson and Pielou evenness indices than CSP. Vegetation coverage and community height were significantly lower in WSP than in CSP (p<0.01). Number of plant species was significantly smaller in WSP (7-16 species/m^2) than in CSP (17-22 species/m^2) (p0.001). Aboveground biomass of Gramineae was significantly lower in WSP than in CSP (p<0.01). Subdominant species in WSP were Kobresia humilis, Leontopodium nanwn and Potentilla anserina which were short in height and grazing-resistant, while those in CSP were Poa pratensis, Elymus nutans and Kobresia capillifolia which were tall in height. It was considered that long-term rotational grazing of yak in warm and cold seasons decreased floral diversity and biomass of plants, especially in Gramineae in WSP as compared with those in CSP, and the deterioration was going on in WSP.
DOI： 10.20652/abm.43.1_1
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Botanical composition, aboveground biomass and grazing behaviour of yak (Bos grunniens) in southern rangeland of Qinghai Province, China. Reviewed
Song Rende, Hasegawa Nobumi, Idota Sachiko, Li Guomei, Nishiwaki Aya, Jiu Cairen, Xu Ning, Zhou Qingping
Proceedings of the 2nd China- Japan-Korea Grassland Conference 289 - 291 2006.8
Language：English Publishing type：Research paper (international conference proceedings)
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Effect of long-term seasonal grazing of yak (Bos grunniens) on botanical diversity of Potentilla fruticosa alpine rangeland in Qing-Zang Plateau. Reviewed
Li Guomei, Idota Sachiko, Hasegawa Nobumi, Song Rende, Wang Youliang and Feng Shengqing
Proceedings of the 2nd China- Japan-Korea Grassland Conference 149 - 151 2006.8
Language：English Publishing type：Research paper (international conference proceedings)
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Differences in yak (Bos grunniens) grazing behaviour and chemical composition of feces in the southern and northern Qinghai-Tibetan Plateau in China. Reviewed
Hasegawa Nobumi, Song Rende, Kozono Masaharu, Idota Sachiko, Nishiwaki Aya, Li Guomei, Fukuda Akira, Zhou Qingping.
Proceedings of the 2nd China- Japan-Korea Grassland Conference 286 - 288 2006.8
Language：English Publishing type：Research paper (international conference proceedings)
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ネピアグラスの乾物収量とin vitro乾物消化率に対する堆肥施用の後作用
Sunusi Ambo Ako, 石井 康之, 深川 聡, 伊戸田 幸子
宮崎大学農学部研究報告 52 ( 1 ) 41 - 46 2006.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：宮崎大学
ネピアグラス（品種Wruk wona）の乾物収量とin viro乾物消化率（IVDMD）に対する前年度2カ年の堆肥施用と刈取り頻度の後作用を、成長形質（乾物重、葉面積）、窒素吸収量およびin viro可消化乾物収量の面から、3年目に無施肥の2回刈り条件で検討した。収穫部の乾物収量、全窒素吸収量およびin viro可消化乾物収量は堆肥施用量が増すほど増加し、刈取り頻度が増すほど低下した。3カ年の実験期間における施用した堆肥中の窒素利用効率は、堆肥施用量が増すほど、あるいは刈取り頻度が増すほど低下した。
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After-effect Manure Application on Dry Matter Yield and in vitro Dry Matter Digestibility of Napiergrass (Pennisetum purpureum Schumach)(共著）
Ambo Ako SUNUSI, Yasuyuki ISHII, Satoru FUKAGAWA, Sachiko IDOTA
Bulletin of the Faculty of Agriculture, University of Miyazaki 52 ( 1-2 ) 41 - 46 2006.3
Language：English Publishing type：Research paper (bulletin of university, research institution)
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Ishii Yasuyuki, Nagatomi Keiichi, Idota Sachiko, Kagehigashi Seiichi
Abstracts of Meeting of the CSSJ 221 ( 0 ) 58 - 58 2006
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：CROP SCIENCE SOCIETY OF JAPAN
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Grazing suitability of various Napier grass varieties in paddocks of different ages
Ishii Y., Mukhtar M., Tudsri S., Idota S., Nakamura Y., Fukuyama K.
Pastoral Systems in Marginal Environments: Proceedings of a Satellite Workshop of the XXth International Grassland Congress, July 2005, Glasgow, Scotland 2005.12
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Pastoral Systems in Marginal Environments: Proceedings of a Satellite Workshop of the XXth International Grassland Congress, July 2005, Glasgow, Scotland
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Idota Sachiko, Hasyim Hadijah, Wadi Ahmad, ISHII Yasuyuki
Grassland science 51 ( 3 ) 259 - 267 2005.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
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Ishii Yasuyuki, Mukhtar Muhammad, Idota Sachiko, FUKUYAMA Kiichi
Grassland science 51 ( 3 ) 223 - 234 2005.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Grassland Science
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Mineral Properties and their Balance in Manure, Soil, Plant and Water of Pot-cultured Napiergrass (Pennisetum purpureum Schumach)（共著） Reviewed
Sachiko Idota, Hadijah Hasyim, Ahmad Wadi and Yasuyuki Ishii
GRASSLAND SCIENCE 51 ( 3 ) 259 - 267 2005.9
Language：English Publishing type：Research paper (scientific journal)
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Rotational grazing system for beef cows on dwarf napiergrass pasture oversown with Italian ryegrass for 2 years after establishment（共著） Reviewed
Yasuyuki. Ishii, Muhammad. Mukhtar, Sachiko Idota and Kiichi Fukuyama
Grassland Science 51 ( 3 ) 223 - 234 2005.9
Language：English Publishing type：Research paper (scientific journal)
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Grazing suitability of various Napier grass varieties in paddocks (共著） Reviewed
Y. Ishii, M. Mukhtar, S. Tudsri, S. Idota, Y. Nakamura and K. Fukuyama
Proceedings of a satellite workshop of the XXth International Grassland 151 - 151 2005.7
Language：English Publishing type：Research paper (international conference proceedings)
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Herbage quality of dwarf Napier grass under a rotational cattle grazing (共著） Reviewed
Y. Ishii, A.A. Sunusi, M. Mukhtar, S. Idota and K. Fukuyama
Proceedings of a satellite workshop of the XXth International Grassland 150 - 150 2005.7
Language：English Publishing type：Research paper (international conference proceedings)
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Yield trends and mineral concentration changes in maize and Italian ryegrass cropping system (共著) Reviewed
S. Idota and Y. Ishii
Proceeding of a satellite workshop of the XXth International Grassland Congress 118 - 118 2005.7
Language：English Publishing type：Research paper (international conference proceedings)
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Dry matter production and in vitro dry matter digestibility of tillers among napiergrass (Pennisetum purpureum Schumach) varieties （共著） Reviewed
Ishii, Y., Yamaguchi N and Idota S.
GRASSLAND SCIENCE 51 ( 2 ) 153 - 163 2005.6
Language：English Publishing type：Research paper (scientific journal)
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コンテナ栽培したシバ（Zoysia japonica Steud.）に見られた土壌流亡防止効果（共著）
井戸田幸子・平田友和・石井真木子・石井康之
日本草地学会九州支部会報 35 ( 1 ) 34 - 35 2005.1
Language：Japanese Publishing type：Research paper (scientific journal)
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九州の造成初年目および二年目の矮性型ネピアグラス草地における肉用繁殖雌牛の放牧特性
ムクタル ムハマド, 石井 康之, 井戸田 幸子, 堀井 洋一郎, 園田 立信
Grassland science = 日本草地学会誌 50 ( 2 ) 121 - 131 2004.6
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
矮性型ネピアグラス草地の輪換放牧特性を検討するため、晩期出穂型の矮性型ネピアグラス品種(DL)の発根した分げつ苗を移植して造成した5aの草地で、造成初年目および2年目の2001年および2002年に、3頭の肉用繁殖雌牛による放牧利用を行なった。輪換放牧回数は2001年では4回、2002年では5回であり、いずれも草量に応じて約1週間放牧した後、2001年では約3週間、2002年では約1ヶ月休牧した。茎数は両年ともに最終回の放牧時まで増加し、乾物現存量は、両年ともに第4回目の放牧時まで増加したが、草高、平均一茎重および葉身重比率は放牧を重ねるごとに減少する傾向であった。放牧前の茎数と次回の茎数増加比を畦ごとに比較すると、両年ともに、放牧に伴い茎数が増加し茎数増加比が低下したため、両者の間に負の相関関係が成立ち、茎数は初回および2回目の放牧後に大きく増加することが示された。層別刈取り法により放牧前の葉身比率(PLB)を検討したところ、両年ともに、草冠の頂部から2層では、PLBはほぼ100％、3層目の1年目および2年目では約95％および80％であり、葉身被食率は上位の2層では100％、3層目ではほぼ100％であった。家畜による被食量(HC)は放牧を重ねるごとに、3ないし4回目の放牧時まで増加し、最終回の放牧では低温による再生速度の低下により減少した。家畜当たりの乾物摂取量(DMI)は、1年目では4.3-10.8kgDM/頭/日、2年目では6.7-11.4kgDM/頭/日(15.5-28.6gDM/kgLW/日)の範囲であった。日中のDLの採食時間比率は放牧開始日では約60％であり、最終日ではこの比率が増加する傾向であった。造成後2年目の2回目から4回目までの放牧期間においてDMIが約20gDM/kgLW/日以上であれば、濃厚飼料の供給なしに、家畜生体重がほぼ維持されることが示された。
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Grazing characteristics in the Dwarf Napiergrass (Pennisetum purpureumSchmach) Pasture by Breeding Beef Cows at the First and Second Yearsafter Establishment in Kyushu （共著） Reviewed
Muhammad Mukhtar, Yasuyuki Ishii, Sachiko Idota, Yoichiro Horiiand Tatsunobu Sonoda
Grassland Science 50 ( 2 ) 121 - 131 2004.6
Language：English Publishing type：Research paper (scientific journal)
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バヒアグラス草地に移植した普通型と矮性型のネピアグラスにおける放牧適性
Mukhtar Muhammad, 石井 康之, Tudsri Sayan, 井戸田 幸子, 福山 喜一, 園田 立信
Grassland science = 日本草地学会誌 50 ( 1 ) 15 - 23 2004.5
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
バヒアグラス(Paspalum noaum Flugge cv. Pensacola)草地に移植した普通型と矮性型のネピアグラス(Penniseum purpureum Schumach)における放牧適性を比較するため、本研究では普通型ネピアクラス品種としてWruk wona (Wr)、矮性型ネピアグラス品種として早期出穂型(DE)および晩期出穂型(DL)の造成後2-3年目の草地を供試した。放牧季節は、2001年および2002年ともに6月から11月であり、約3.5aの牧区に、乳用牛15-16頭、肉用牛2-3頭を昼間の約5-7.5時間放牧し、約1ケ月休牧する輪換放牧を行った。株の越冬率と越冬株の再生茎数は、2001年、2002年の5月ではともにDLが最も高かった。草高、草量および平均1茎重は放牧期間を通してWrが最も高く、茎数と葉面積指数はDLがWrとDEより大きく、葉身比率と葉/茎比はWrに比べ矮性型の2品種で高かった。被食量はDLが最も高く、次いでWr、DEの順であり、利用率はDLが最も高く、次いでDE、Wrの順であり、バヒアクラスが最も低くなった。採食時間比率は両年ともに、初回放牧時ではバヒアグラスが最も高かったが、放牧を繰り返すごとに、DLの比率が大きく増加し、次いでWr、DEの順に高くなったのに対して、バヒアグラスのそれは減少する傾向であった。以上のことから、高い利用率と高い越冬性を示すDLが、南九州における集約的な放牧利用に最も適するネピアグラス品種であることが示唆された。
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Grazing Suitability of Normal and Dwarf NapiergassesTransplanted on a Bahiagrass pasture（共著） Reviewed
Muhammad Mukhtar, Yasuyuki Ishii, Sayan Tudsri, Sachiko Idota,Kiichi Fukuyama and Tatsunobu Sonoda
Grassland Science 50 ( 1 ) 15 - 23 2004.4
Language：English Publishing type：Research paper (scientific journal)
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SONG Rende, HASEGAWA Nobumi, IDOTA Sachiko, LI Guomei, ZHANG Yongming, WANG Wengguang, ZHAO Youbang, SONODA Tatsunobu
Japanese journal of livestock management 40 ( 1 ) 1 - 7 2004.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Nihon Kachiku Kanri Gakkai
In order to clarify the effects of administrating selenium (Se) and vitamin E (V.E) on the recovery of the corpus luteum function and serum Se and V.E concentrations, 20 mg of Se and 544 IU of vitamin E were intramuscularly injected once into five grazing late-pregnant Yaks (Treatment). The changes of serum Se, V.E and progesterone (P_4) levels after injection were examined and compared with that of five non-treated ones (Control). 1) The serum Se concentration of Treatment increased from 17.5±3.4 before injection to 45.2±3.8 ng/ml in the 2nd week after injection (P<0.001), and then it declined until the end of the 8 th week. However, Control kept it lower than Treatment through experimental period. In the 2nd, 4th, and 8th weeks after injection, the serum Se concentrations of Treatment were significantly higher than those of Control (p<0.001, p<0.05 and p<0.05 respectively). 2 ) Serum V.E concentration of Treatment was 422±70ng/dl before injection and decreased in the 4th week after injection around parturition. It increased significantly in the 6th and 8th weeks (p<0.001) after injection as compared with that before injection. And also it was higher than that of Control in the 4 th, 6 th and 8 th weeks after injection. Serum V.E concentration of Control decreased significantly around parturition as compared with that before parturition (p<0.05) and thereafter kept lower level than that of Treatment. 3) The serum P_4 concentration of Treatment showed an increasing trend in the early post-partum period as compared with that of Control. The serum P_4 concentrations in the 8 th week after parturition were higher in Treatment than in Control (p<0.05).
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Effects of Cutting Interval and Cutting Height on Dry Matter Yeild and Overwintering Ability at the Established Year in Pennisetum Species（共著） Reviewed
Ahamad Wadi，Yasuyuki Ishii and Sachiko Idota
Plant Production Science 7 ( 1 ) 88 - 96 2004.3
Language：English Publishing type：Research paper (scientific journal)
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妊娠後期の放牧ヤクにおけるセレニウム（Se）とビタミンE（V. E）投与後の血清中Se, V. E およびプロジェステロン濃度の変動. Reviewed
宋 仁徳，長谷川信美，井戸田幸子，李 国梅，張 永明，王 文光，趙 友邦，園田立信
日本家畜管理学会誌 40 ( 1 ) 1 - 7 2004.3
Language：Japanese Publishing type：Research paper (scientific journal)
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Wadi A., Ishii Y., Idota S.
Plant Production Science 7 ( 1 ) 88 - 96 2004.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Plant Production Science
The effects of cutting interval and cutting height on dry matter productivity and overwintering ability were compared among 4 Penniselum species, napiergrass, kinggrass, hybrid napiergrass and pearl millet in the established year to examine the suitable cutting practice for the productivity and persistence. The cutting intervals were 60 and 90 days, and the cutting heights were 0 and 30 cm above the ground. Annual herbage dry matter yield (HDMY) was the highest in kinggrass, followed by hybrid napiergrass, napiergrass and pearl millet, and was higher in the plants at a 90-day interval and 0-cm height than at a 60-day interval and 30-cm height, respectively. The percentage of dry matter to fresh matter did not correlate with the annual HDMY or cutting height. The plants cut at a 90-day interval at a 0-cm height had the highest in mean tiller weight, crop growth rate, net assimilation rate and HDMY, but the lowest tiller number and percentage leaf blade to the whole harvested plant. Thus, the correlation coefficients between HDMY and plant characters were positive for plant height, mean tiller weight, leaf area index and crop growth rate in all 4 species and were negative for tiller number and percentage leaf blade except for pearl millet. Both percentage overwintered plants and regrown tiller number were the highest in kinggrass followed by napiergrass and hybrid napiergrass; these were nil in pearl millet under all cutting practices, and were higher in the plants cut at a 30-cm height than at a 0-cm height. This tended to be associated with higher tiller bud number and higher total nonstructural carbohydrate concentration in the stubble after cutting at a 30-cm height. Regrown tiller number was higher in the plants cut at a 60-day interval than at a 90-day interval in all species except for pearl millet, but the percentage overwintered plants was not affected by the cutting interval. Thus, the combination of highest annual HDMY and highest overwintering ability was attained by cutting at a 90-day interval at a 30-cm height in kinggrass.
DOI： 10.1626/pps.7.88
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ネピアグラス植物体および土壌中の無機成分含有量に及ぼす堆肥施用量の影響（共著）
井戸田幸子・Hadijah HASHIM・Ahmad WADI・石井康之
日本草地学会九州支部会報 34 ( 1 ) 44 - 46 2004.1
Language：Japanese Publishing type：Research paper (scientific journal)
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湛水栽培可能な暖地型イネ科牧草Paspalum atratumの乾燥耐性(共著）
石井康之・平野亜津子・井戸田幸子
日本草地学会九州支部会報 34 ( 1 ) 47 - 49 2004.1
Language：Japanese Publishing type：Research paper (scientific journal)
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ネピアグラスとキンググラスにおける乾物蓄積と関連した分げつおよび葉の展開に及ぼす施肥量の影響
ワディ アーマド, 石井 康之, 井戸田 幸子
Grassland science = 日本草地学会誌 49 ( 4 ) 311 - 323 2003.10
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
ネピアグラス及びネピアグラスとパールミレットとの交雑種であるキンググラスについて、本研究では分げつおよび葉の展開と乾物蓄積との関係に及ぼす3水準の施肥量の影響を、2ケ年にわたり1/2000aワグナーポット栽培により検討した。出現分げつ数(EN)と再生分げつ数(RN)は施肥量を増すほど増加した。これは、施肥量を増すほど分げつの出現速度(RE)と出現期間がより高位の茎ほど増加したためであり、葉の展開速度(RLE)と個葉の葉面積(LA)も同様の傾向であった。生葉数は生育の前半では施肥量の増加に伴い増加したが、その順位は生育後期には逆転した。経時的に主茎の全葉面積(SlLA)を測定したところ、SILAは平均の茎葉面積(LA/)と正の相関関係があり、LA/と葉面積指数(LAI)との関係も同様であった。8月における茎の粗タンパク質含有率はENと密接な相関関係が成立ち、LAと日有効気温との間に正の相関関係が認められた。施肥量の増加に伴い、RE、RLEとSILAの増加がLA/の増加と同調しており、これがLAIの増加を通じて乾物蓄積量の増加をもたらした。供試した施肥範囲では高施肥量ほど費用対効果が低下したが、いずれの施肥範囲でも、購入粗飼料に比べて十分競合しうる価格で乾物蓄積が達成されることが示された。
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Effects of the Level of Fertilizer Input on Tiller and Leaf Development in Relation with Dry Matter Accumulation of Napiergrass and Kinggrass（共著） Reviewed
Ahmad WADI, Yasuyuki ISHII and Sachiko IDOTA
Grassland Science 49 ( 4 ) 311 - 323 2003.10
Language：English Publishing type：Research paper (scientific journal)
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WADI Ahmad, ISHII Yasuyuki, HASYIM Hadijah, IDOTA Sachiko
日本草地学会誌 49 ( 0 ) 110 - 111 2003.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
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MUKHTAR Muhammad, ISHII Yasuyuki, TUDSRI Sayan, KINOSHITA Hirofumi, IDOTA Sachiko, FUKUYAMA Kiichi, SONODA Tatsunobu
日本草地学会誌 49 ( 0 ) 114 - 115 2003.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
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HASYIM Hadijah, NUMAGUCHI Hirotsugu, ISHII Yasuyuki, IDOTA Sachiko
日本草地学会誌 49 ( 0 ) 112 - 113 2003.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
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Dry Matter Productivity and Overwintering Ability of the Dwarf and Normal Napiergrasses as Affected by the Planting Density and Cutting Frequency（共著） Reviewed
Muhammad Mukhtar, Yasuyuki Ishii, Sayan Tudsri, Sachiko Idota
Plant Production Science 6 ( 1 ) 65 - 73 2003.3
Language：English Publishing type：Research paper (scientific journal)
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Mukhtar M., Ishii Y., Tudsri S., Idota S., Sonoda T.
Plant Production Science 6 ( 1 ) 65 - 73 2003.3
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Plant Production Science
The effects of planting density and cutting frequency on dry matter productivity and overwintering ability were compared in the years following establishment among dwarf varieties (early-heading, DE and late-heading, DL) and normal varieties, Wruk wona (Wr) and Merkeron (Me), in the southern part of Kyushu, Japan. The planting densities examined were high (16 plants m-2, 25 cm × 25 cm of spacing), medium (8 plants m-2, 50 cm × 25 cm), and low (4 plants m-2, 50 cm × 50 cm) for Wr, DE and DL, and was only medium for Me. The cutting frequency was three times at about 60-day intervals in 1999 and two times at about 90-day intervals in 2000. Irrespective of the planting density, dwarf varieties were higher in tiller number (TN), leaf area index (LAI) and dry weight percentage of leaf blade (PLB) than normal varieties, but lower in plant height (PLH), mean tiller dry matter weight (MTW) and total dry matter weight at all planting densities in both years. With the increase in planting density, TN and annual herbage dry matter yield (HDMY) increased. The annual HDMY was higher in 2000 (cut twice) than in 1999 (cut three times), and the difference in annual HDMY between the dwarf and normal varieties was reduced by planting at a high density and cut twice. This was due to higher MTW in dwarf varieties than in normal varieties at the higher TN conditions. The percentage of overwintered plant (POP) tended to be higher in DL than in other varieties and was higher in 2000 than in 2001 for all varieties, while it tended to decrease with the increase in planting density. Even though the dry matter productivity was higher in the normal varieties than in the dwarf varieties at any planting density and cutting frequency, DL tended to show a stable productivity with high PLB irrespective of planting density and cutting frequency. In addition, it had a high overwintering ability compared with the other varieties.
DOI： 10.1626/pps.6.65
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ネピアグラスとキンググラスにおける乾物生産性に及ぼす施肥量の影響
ワディ アーマド, 石井 康之, 井戸田 幸子
Grassland science = 日本草地学会誌 48 ( 6 ) 490 - 503 2003.2
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
世界の熱帯および亜熱帯地域において、ネピアグラスおよびネピアグラスとパールミレットとの交雑種であるキンググラスは、高い乾物生産性を示す青刈り飼料作物である。本研究では、植物体各器官の生長と乾物生産性に及ぼす3水準の施用量の影響を、2カ年にわたり1/2000aワグナーポット栽培により生長解析法で検討した。草丈、1茎当たりの総展開葉数（TELN/S）、総乾物重（TDMW）、茎乾物重、根乾物重および平均-茎重（MTW）は生育に伴い増加し、増加の程度は施肥量を増すほど高まった。茎数（TN）は植え付けから7月まで増加した後徐々に減少した。地上部重/根重比は、施肥量の増加に伴い増加したが、葉身/茎比には施肥量の影響が見られなかった。個体群生長速度（CGR）と葉面積指数（LAI）は、植え付けから9月まで徐々に増加した後減少し、両草種共に施肥量の増加に伴い増加した。植物体諸形質と生長関数との関係では、TELN/SとLAIとの間には、両草種共にいずれの施肥量でも負の（上に凸の）2次曲線が得られ、TELN/Sの変化がLAIの変化に対する主要因の1つと判断された。LAIとCGRとの関係は、両草種共に同一生育期間では施肥レベルを込みにして直線的であり、CGRはLAIの増加に伴い増加し、LAIの分布範囲は施肥量の増加に伴い拡大することが示唆された。総クロロフィル含有率は生育に伴い多肥区ほど大きく低下した。以上の結果から、施肥量の増加に伴うTNおよびTELN/Sの増加は、LAIの増加を通じてCGRの増加と密接に関連しており、これらは、両草種共にTDMWの増加に大きく影響する植物体の要因と推察された。草種間差については、施肥量の変化に対するTN、TELN/SおよびMTWの反応がほぼ補償的であるため、同一施肥量ではLAI、CGRさらに最終的にはTDMWが、両草種ともほぼ一致する結果となった。
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Effects of the Level of Fertilizer Input on Dry Matter Productivity of Napiergrass and Kinggrass（共著） Reviewed
Ahmad WADI, Yasuyuki ISHII and Sachiko IDOTA
Grassland Science 48 ( 6 ) 490 - 503 2003.2
Language：English Publishing type：Research paper (scientific journal)
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2-27 バヒアグラス草地に移植したネピアグラス普通種および矮性種における採食特性
MUKHTAR Muhammad, ISHII Yasuyuki, WADI Ahmad, KINOSHITA Hirofumi, IDOTA Sachiko, FUKUYAMA Kiichi, SONODA Tatsunobu
日本草地学会誌 48 ( 0 ) 116 - 117 2002.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
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5-9 雑草ハマスゲ (Cyperus rotundus L.) 塊茎の土中分布と萌芽に関する研究
丹羽 周一, 井戸田 幸子, 石井 康之, 沼口 寛次
日本草地学会誌 48 ( 0 ) 272 - 273 2002.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
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2-29 造成初年度のネピアグラスとキンググラスにおける刈取り間隔と刈取り高さが乾物生産性に及ぼす影響
WADI Ahmad, ISHII Yasuyuki, MUKHTAR Muhammad, KINOSHITA Hirofumi, IDOTA Sachiko
日本草地学会誌 48 ( 0 ) 120 - 121 2002.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
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2-28 造成初年度における矮性ネピアグラス草地の肉用繁殖牛による採食特性
MUKHTAR Muhammad, ISHII Yasuyuki, WADI Ahmad, KINOSHITA Hirofumi, IDOTA Sachiko, HORII Youichiro, SONODA Tatsunobu
日本草地学会誌 48 ( 0 ) 118 - 119 2002.9
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：日本草地学会
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ネピアグラスの矮性品種を用いた飼料畑造成方法の検討（共著）
ムハマド ムクタール・石井康之・木之下博文・井戸田幸子・園田立信
日本草地学会九州支部会報 31 ( 2 ) 55 - 56 2002.1
Language：Japanese Publishing type：Research paper (scientific journal)
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ネピアグラスとキンググラスにおける乾物生産性と分げつ及び葉身の抽出に及ぼす窒素施用量の影響（共著）
アーマド ワディ・石井康之・木之下博文・井戸田幸子・川村 修
日本草地学会九州支部会報 31 ( 2 ) 53 - 54 2002.1
Language：Japanese Publishing type：Research paper (scientific journal)
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中国内蒙古地方における環境保全型草地農業の創出 1.有畜農業地域におけるトウモロコシ連作畑の地力維持（共著） Reviewed
井戸田幸子・馬場光久・小林裕志・佐藤幸一・杉浦俊弘・桂 栄・那 日蘇
日本草地学会誌 46 ( 1 ) 58 - 65 2000.4
Language：Japanese Publishing type：Research paper (scientific journal)
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中国内蒙古地方の農牧交差地におけるトウモロコシ連続栽培畑の地力維持 Reviewed
井戸田幸子
1999.3
Language：Japanese Publishing type：Master’s thesis