論文 - 井戸田 幸子
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Zhong Z., Niimi M., Tobisa M., Idota S., Ishii Y.
Agriculture (Switzerland) 14 ( 8 ) 2024年8月
掲載種別：研究論文（学術雑誌） 出版者・発行元：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年6月
掲載種別：研究論文（学術雑誌） 出版者・発行元：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年
掲載種別：研究論文（学術雑誌） 出版者・発行元：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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異なる生育段階の飼料用トウモロコシへの水溶性殺虫剤散布度模擬調査
石垣 元気, 井戸田 幸子, 石井 康之
日本草地学会誌 67 ( 4 ) 183 - 188 2022年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：日本草地学会
飼料用トウモロコシの異なる生育段階において，ブームスプレーヤ，電動噴霧器，ドローンを用いて，水散布または農薬散布し，感水紙の被覆面積率を画像処理ソフトにより算出することで散布度を模擬調査した。その結果，ブームスプレーヤによる散布では生育段階1-2および2-3葉期では，散布量100 L/10 a，200 L/10 aのいずれにおいても散布個体の上位葉・中位葉の散布度は60％以上であった。特に1-2葉期・散布量200 L/10 aでは散布度が98％以上であった。生育段階5-6葉期以降・散布量100 L/10 aでは散布度が50％未満と低下した。ブームスプレーヤでは，生育段階9-10葉期の上位葉・中位葉の散布度は下位葉よりも低い値であった一方で，電動噴霧器では，上位葉・中位葉の散布度が下位葉よりも高い値であった。糊熟期におけるドローンによる散布では散布量100 L/10 aの場合，葉身に対する散布度は，上位葉および中位葉の基部および中央部では60％を超えた。以上の結果は，飼料用トウモロコシのツマジロクサヨトウ防除における農薬散布方法選択のための基礎的知見として活用できる。今後，散布度と防除効果との関係を明らかにする必要がある。
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Growth and Yield Potentials of Pearl Millet (Pennisetum typhoides) under Different Sowing Dates in Southern Kyushu, Japan 査読あり
Bokun Li, Yasuyuki Ishii, Sachiko Idota, Yingkui Yang and Mitsuhiro Niimi
Wulfenia Journal 27 ( 1 ) 67 - 80 2020年3月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Yield and quality of forages in a triple cropping system in southern Kyushu, Japan 査読あり
Li B., Ishii Y., Idota S., Tobisa M., Niimi M., Yang Y., Nishimura K.
Agronomy 9 ( 6 ) 2019年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：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 査読あり
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年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Feasibility of early sowing of spring maize (Zea mays) in triple forage cropping in southern Kyushu, Japan 査読あり
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年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Agronomic traits of high-yielding sorghum (Sorghum bicolor Moench ‘Tarzan’) in Miyazaki Prefecture 査読あり
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年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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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. 査読あり
Yukimi Nakata, Sachiko Idota, Manabu Tobisa, Yasuyuki Ishii
Agricultura lSciences 9 129 - 140 2018年1月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Grazing potential of foggage and fresh dwarf napiergrass pasture by breeding beef cows in southern Kyushu, Japan. 査読あり
Kadwal M.H., Ishii Y., Goto A., Li B.K., Idota S., Niimi M., Ishigaki G., Fukuyama K.
Wulfenia Journal 2018年1月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Utamy R., Ishii Y., Idota S., Khairani L.
Agronomy 8 ( 3 ) 2018年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：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 査読あり
Yang Y., Li B., Idota S., Ishii Y.
Asian Journal of Crop Science 9 ( 1 ) 1 - 10 2017年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：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 査読あり
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年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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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. 査読あり
Hadijah Hasyim, Ahmad Wadi, Yasuyuki Ishii, Sachiko Idota and Kiichi Fukuyama
American Journal of Applied Sciences 13 ( 5 ) 479 - 489 2016年6月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Effect of Sowing Rate on Agronomic Traits of Sorghum (Sorghum bicolor Moench) in Southern Kyushu, Japan. 査読あり
Sachiko Idota, Yasuyuki Ishii, Mayumi Izu, Yukistugu Nishimura
Agricultural Sciences 7 308 - 314 2016年5月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Hasyim H., Wadi A., Ishii Y., Idota S., Fukuyama K.
American Journal of Applied Sciences 13 ( 5 ) 479 - 489 2016年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：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. 査読あり
Hadijah Hasyim, Yasuyuki Ishii, Ahmad Wadi and Sachiko Idota
American Journal of Agricultural and Biological Sciences 11 ( 1 ) 35 - 44 2016年2月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Residual effects of compacted digested effluent on growth of dwarf napier grass in warm regions of Japan. 査読あり
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年2月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Yang Y., Ishii Y., Idota S.
American Journal of Agricultural and Biological Science 11 ( 1 ) 19 - 28 2016年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：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).