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Faculty of Agriculture Region of Animal and Plant Biosciences |
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IDOTA Sachiko
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Degree 【 display / non-display 】
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博士（農学） ( 2007.3 鹿児島大学 )
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修士（農学） ( 2000.3 北里大学 )
Research Areas 【 display / non-display 】
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Life Science / Animal production science
Papers 【 display / non-display 】
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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)
Books 【 display / non-display 】
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Field oand Laboratory Methods for Grassland Science "jointly worked"
（ Role： Joint author）
2004.3
Language：Japanese Book type：Scholarly book
MISC 【 display / non-display 】
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飼料用トウモロコシに対するツマジロ クサヨトウ防除の取り組みについて Invited
石井 康之・井戸田 幸子・石垣 元気
牧草と園芸 69 ( 3 ) 10 - 14 2021.5
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (trade magazine, newspaper, online media)
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生産コスト低減に向けての新規自給飼料生産の開発
石井康之,岩村康司,小畑 寿,立山松男,須崎哲也,有馬典男,黒木 寿,井戸田幸子
日本草地学会誌 61 ( 1 ) 27 - 30 2015.4
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本草地学会
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口蹄疫防疫措置の終了した発生農場に留置された家畜排泄物の状態
井戸田幸子, 飛佐 学, 上村涼子, 堀井洋一郎, 末吉益雄, 石井康之, 西脇亜也, 山本直之
日本草地学会誌 58 ( 4 ) 277 - 279 2013.1
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本草地学会
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口蹄疫家畜埋却地における環境修復能力の高い飼料作物利用の可能性
西脇亜也，石井康之，井戸田幸子，横田雅人
日本草地学会誌 58 ( 4 ) 266 - 268 2013.1
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本草地学会
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中国のフィールド調査から学んだ多くのこと
井戸田 幸子
日本草地学会誌 57 ( 2 ) 108 - 111 2012.4
Language：Japanese Publishing type：Article, review, commentary, editorial, etc. (scientific journal) Publisher：日本草地学会
Presentations 【 display / non-display 】
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アシベンゾラルS-メチルの施用時期がクリーピングベントグラスに及ぼす影響
井戸田 幸子・飛佐 学・奥野 健太郎
日本芝草学会2024年度 山梨大会 2024.6.16
Event date： 2024.6.14 - 2024.6.16
Language：Japanese Presentation type：Oral presentation (general)
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Effects of application of acibenzolar-S-methyl on creeping bentgrass
Sachiko IDOTA, Ai SHIRAISHI, Manabu TOBISA and Kentaro OKUNO
2023.6.11
Event date： 2023.6.8 - 2023.6.11
Language：Japanese Presentation type：Oral presentation (general)
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飼料用トウモロコシの剪葉処理が葉面展開および植物体の成長に及ぼす影響
石井康之, LiBokun, 新美光弘, 井戸田幸子
日本草地学会 (静岡大学) 日本草地学会
Event date： 2020.3.24 - 2020.3.26
Language：English Presentation type：Oral presentation (general)
Venue：静岡大学
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南九州地域における数種暖地型マメ科牧草の生産性ならびにネコブセンチュウ被害
飛佐学,鵜木実花子,武井恒介,井戸田幸子
日本草地学会 (静岡大学) 日本草地学会
Event date： 2020.3.24 - 2020.3.26
Language：Japanese Presentation type：Poster presentation
Venue：静岡大学
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窒素施肥がテフグラスの乾物重および硝酸態窒素含量に及ぼす影響
井戸田幸子, 石垣元気, 李国梅, NitthaisongPattama, 本田直樹, 飛佐学, 石井康之
日本草地学会 (静岡大学) 日本草地学会
Event date： 2020.3 - 2020.3.26
Language：Japanese Presentation type：Oral presentation (general)
Venue：静岡大学
Awards 【 display / non-display 】
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平成26年度宮崎大学女性研究者奨励賞
2015.3 宮崎大学
井戸田幸子
Country：Japan
Grant-in-Aid for Scientific Research 【 display / non-display 】
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ネピアグラス栽培による口蹄疫家畜埋却地および耕作放棄地の飼料・資源作物生産
Grant number：16K07577 2016.04 - 2019.03
科学研究費補助金 基盤研究(C)
Authorship：Coinvestigator(s)
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ネピアグラス栽培による重金属汚染、口蹄疫家畜埋却、耕作放棄土壌の修復・飼料生産
Grant number：25450025 2013.04 - 2016.03
科学研究費補助金 基盤研究(C)
Authorship：Coinvestigator(s)
ネピアグラスを用いた環境修復および飼料生産に関する研究。
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チベット-トランスヒマラヤ高山草原における生態系保全型放牧システムに関する研究
Grant number：23255015 2011.04 - 2014.03
科学研究費補助金 基盤研究(A)
Authorship：Coinvestigator(s)
ヒマラヤ山脈周域には広大な高山草原が広がり，数千年にわたり草食動物の放牧・遊牧がなされてきた。地球温暖化の影響により氷河の縮小，高山草原の乾燥化，砂漠化が進行し，過放牧などによって植生の荒廃がすすみ，動植物種多様性と家畜生産性の低下・喪失が危惧されている。
本研究プロジェクトは，ヒマラヤ山脈北東のチベット高原と南西のインドのジャンム・カシミール州での少数民族による放牧方式の違いが，生態系物質循環と動植物種多様性に及ぼす影響を明らかにすることを目的としている。このプロジェクトの一部として本研究においては中国青海省高山野草地より土壌を採取し，成分分析を行い，物質循環を明らかにする。
Available Technology 【 display / non-display 】
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テフグラス（Eragrostis tef）の収量性および飼料品質に関する研究
Message：草地の生産性向上や持続的な利用のための様々な管理方法に関する研究に取り組んでいます。