Papers - KAMIJI Yoshiaki
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The Use of a Small-Scale Hydroponic Method for the Evaluation of Taro Leaf Blight (<i>Phytophthora colocasiae</i>) Reviewed International journal
KAMATA Atsushi, KAMIJI Yoshiaki
Tropical Agriculture and Development 68 ( 3 ) 55 - 61 2024.09
Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：Japanese Society for Tropical Agriculture
We present a small-scale hydroponic method for demonstrating the spread of <i>Phytophthora colocasiae</i>, the causal agent of taro leaf blight disease. By recreating the nutritional content of the soil used for commercial taro production in the hydroponic unit, our protocol was used to effectively evaluate the leaf browning caused by <i>P. colocasiae</i>. Leaf lesions in Mg/K-treated taro plants subsequently decreased the lotus effect of the leaves. In addition, the contact angle of water droplets was decreased from 130° to 80° between the control and Mg/K-treated plants. We found that the Mg/ K ratio-treated plants tended to spread water-soaked lesions and a greater lodging index than the control treatment. <br>This hydroponic system can operate in a limited space, only a few facilities needed, low labor requirements, a low concomitant infection risk, and generates reproducible results for lesions caused by <i>P. colocasiae</i>. This system, therefore, offers a new approach to research on disease resistance and nutrients.
DOI： 10.11248/jsta.68.55
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Early Rice Straw Plowing by Unmanned Tractor Coordinated with Combine Harvesting: Reviewed
SHINOMIYA Kazutaka, KAMIJI Yoshiaki, ISHII Takafumi, TOMINAGA Shinsuke, IIDA Toshiaki
Japanese Journal of Farm Work Research 59 ( 2 ) 61 - 77 2024.06
Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japanese Society of Farm Work Research
<p>Incorporation of rice straw in the paddy soil immediately after the rice has been harvested is expected to increase the content of inorganic nitrogen in the soil by the following spring. In practice, however, rice straw is often incorporated during the winter off-season due to labor shortages during the harves. In the present study, the smart system that an unmanned robot-tractor is collaborate-operated for the incorporation of rice straw simultaneously with a combine harvester worked in nearby paddy field plot was examined. The goal of this smart system was the incorporation of rice straw as early as possible while minimizing labor needs. Using this smart system, we showed that the labor needs could be reduced by 13% compared to the local conventional system that rice straw was incorporated by man-operated tractor after rice harvest in autumn or winter. The work efficiency using this smart system was reduced because of unexpected stops made by the robot-tractor due to a malfunctioning obstacle sensor. The yields of rice produced by this smart system was 6-11% higher than that obtained by local conventional system in three rice cultivars. The inorganic nitrogen concentration in the paddy soil applied smart system was a little higher than that with local conventional system. However, there were no significant differences in both rice yield and inorganic nitrogen concentration in soil between 2 systems. These findings demonstrate that incorporation of rice straw using an unmanned robot-tractor on the same day as the rice is harvested could contribute to a reduction in labor and improvement in yield.</p>
DOI： 10.4035/jsfwr.59.61
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Development of a Thickness Fractionation Method to Optimize the Physicochemical Properties and Cooking Qualities of Rice Reviewed
Atsushi Kamata, Yoshiaki Kamiji
Eco-Engineering 35 ( 3 ) 67 - 72 2023.07
Language：English Publishing type：Research paper (scientific journal) Publisher：The Society of Eco-Engineering
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Evaluation of Rice Productivity in Solar-sharing Paddy Fields Reviewed
SUZUKI Yuto, ISHIKAWA Michihiro, IWASAKI Keisuke, KAMIJI Yoshiaki
Japanese Journal of Crop Science 91 ( 3 ) 253 - 254 2022.07
Language：Japanese Publisher：CROP SCIENCE SOCIETY OF JAPAN
DOI： 10.1626/jcs.91.253
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Nitrogen stock and farmer behaviour under rice policy change in Japan Reviewed International journal
Hiroki Kiriyama, HirotakaMatsuda, YoshiakiKamiji, ShigenoriMorita
Journal of Environmental Management 299 1 - 9 2021.12
Language：English Publishing type：Research paper (scientific journal)
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Effects of Rice Cultivation Practice on the Improvement of the Infant Food Consciousness Reviewed
46 ( 2 ) 29 - 42 2015.12
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Relationship between Phosphorus Accumulation and Dry Matter Production in Soybean Reviewed
Jin Kakiuchi, Yoshiaki Kamiji
Plant Production Science 18 ( 3 ) 344 - 355 2015.07
Language：English Publishing type：Research paper (scientific journal)
リン施肥レベルが異なるダイズのポット試験および圃場試験を行た結果，リン欠乏条件下で安定的な生産を上げるには，高いP蓄積能力をもつか，十分な乾物生産量が必要であることが必要であることを明らかにした．
DOI： 10.1626/pps.18.344
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Verification Concerning Effects and Roles that Rice Cultivation Study Brings to Infant Education Reviewed
60 ( 1 ) 18 - 27 2015.06
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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鮫川村における新規造成水田への堆肥施用が土壌窒素無機化特性および水稲の生産性に及ぼす影響 Reviewed
石井洋平，大谷穂菜美，関口幸世，上地由朗
東京農業大学農学集報 60 ( 1 ) 44 - 49 2015.06
Authorship：Lead author Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
福島県鮫川村にある「豊かな土づくりセンター」で作られた堆肥を利用した循環型農業を推進させるための基礎資料を得るため，新たに造成された水田Ⅰ（750m²）と水田Ⅱ（900m²）において，2011年から2013年の3年間に水稲コシヒカリの栽培試験を行ない，成熟期における地上部乾物重，体内窒素，玄米収量を調査するとともに，土壌の窒素無機化特性を評価した．
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Effects of Phosphorus Accumulation on Dry Matter Production and Seed Elements in Wheat Reviewed
Jin Kakiuchi, Yoshiaki Kamiji
22 ( 1 ) 2015.06
Language：Japanese Publishing type：Research paper (scientific journal)
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Shoot biomass in wheat is the driver for nitrogen uptake under low nitrogen supply, but not under high nitrogen supply Reviewed International journal
Yoshiaki Kamiji, Jiayin Pang, Stephen P. Milroy, Jairo A. Palta
Field Crops Research 165 92 - 98 2014.05
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
コムギにおいて窒素吸収量が多い品種では地上部バイオマスが支配因子になっているのか，あるいは窒素吸収量が多いことが地上部バイオマスの増大を支配しているのかを明らかにするために2種類のポット実験を行った結果，低窒素条件下では地上部バイオマスが窒素吸収を支配し，多窒素条件下ではそうではないことがわかった．
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Effect of Foliar Application of Phosphorus on Growth, Yield and Seed Elements in Soybean Reviewed
Jin kakiuchi, Yoshiaki Kamiji
Journal of the Japanese Society of Agriculture Technology Management 20 ( 2 ) 35 - 43 2013.09
Language：Japanese Publishing type：Research paper (scientific journal)
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Practice Activity of the Rice Cultivation Study in the Early Childhood Education and the Effect Reviewed
Mari Omura, Yumiko Goto, Yoshiaki Kamiji
The Japanese Agricultual Education Society 44 ( 1 ) 1 - 13 2013.05
Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal)
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Morphological Traits on the Standard Type and Less-Leaf Type of Rice Reviewed
57 ( 1 ) 1 - 8 2012.06
Authorship：Lead author Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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Effects of different levels of solar radiation and soil volume on the growth and development of potted rice Reviewed
Yoshiaki Kamiji, Tetsuo Sakuratani
Journal of Tokyo University of Agriculture 56 ( 3 ) 212 - 219 2011.12
Authorship：Lead author Language：Japanese Publishing type：Research paper (bulletin of university, research institution)
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Natural Supply of Nitrogen in Tanazawa paddy field by mineralization and irrigation derived from Nakatsu River Reviewed
56 ( 2 ) 183 - 189 2011.09
Language：English Publishing type：Research paper (bulletin of university, research institution)
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Analysis of optimum spikelet number and plant N in rice at Tanazawa paddy field Reviewed
Yoshiaki Kamiji
東京農大農学集報 56 ( 1 ) 1 - 10 2011.06
Language：English Publishing type：Research paper (bulletin of university, research institution)
棚沢水田における土壌窒素の無機化量，灌漑および降雨による供給量の年次変動は小さく，施肥以外のいわゆる窒素の天然供給量は，出穂期までに6～7 g/㎡，成熟期までに9～10 g/㎡と見積もられた．また，この地区の広域水田に利用されている中津川水系の灌漑水による窒素供給量は少なく，水稲の生育や品質には大きな影響を及ぼさないと考えられた．
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Growth and development of rice (Oryza sativa L.) in a semi-shaded, outside artificial space Reviewed
Yosiaki Kamiji, Daizo Igarashi, Tetsuo Sakuratani
Climate Biosphere 11 1 - 11 2011.06
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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N applications that increase plant N during panicle development are highly effective in increasing spikelet number in rice Reviewed International journal
Yoshiaki Kamiji, Hiroe Yoshiada, Jairo A. Palta, Tetsuo Sakuratani, Tatsuhiko Shiraiwa
Field Crops Research 122 ( 3 ) 242 - 247 2011.06
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)
京都，茨城，神奈川の水田において窒素施肥法および施肥量を異にした試験区を設定して10年間の圃場試験を行った結果，穎花数の同一品種の年次変動は穎花分化終期における体内窒素量に強い影響を受けること，穎花数の品種間差は穎花分化終期後2週間のCGRに左右される面が強いことを明らかにした．
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水稲栽培における合理的窒素施肥に関する研究 ―群落の光環境と生産機能からみた「Ｖ字稲作」型施肥の再評価―（博士論文）
上地 由朗
京都大学 2010.01
Language：Japanese Publishing type：Thesis (other)
水稲栽培における合理的窒素施肥方法の基礎として，幼穂発育期窒素施肥を中心に取り上げ，施肥時期，施肥量あるいは時期別施肥配分が，土壌‐作物系の窒素収支，群落の生産機能および穎花生産に及ぼす影響を調査し，Ｖ字稲作型窒素施肥の再評価を行った結果，次のことが明らかとなった．従来重視されてきた幼穂発育期前半の窒素吸収制限は，群落の光環境を明らかに改善するものの，乾物生産および耐倒伏性および穎花生産の諸機能に対する効果は小さいかむしろマイナスであり，現在の水稲栽培においてこれを必須とする合理性は低いものと結論された．