| Project/Area Number |
15K07660
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Agricultural environmental engineering/Agricultural information engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Keywords | 水稲 / 冷夏 / 冷害 / 不稔 / 深水管理 / 晴冷型 / 水田水温 / シミュレーション / 水稲冷害 / 北海道 / 水温 / モデル |
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| Outline of Final Research Achievements |
Paddy water temperatures in Hokkaido were estimated by an existing model with adjusted parameters. Root-mean-square and mean error of estimated water temperatures were 0.9℃ and -0.3℃, respectively. Paddy water temperatures in 1991 to 2015 were simulated with the model. Water temperatures in July, corresponding to the sensitive period of floral sterility caused by low temperature, were higher than air temperature by 1.5℃ to 2.7℃. Percentages of sterility were calculated using two models, and the effect of deep-flood irrigation at the sensitive period in cool summer was estimated by inputting water temperature instead of air temperature. Although calculated percentages of sterility were different between the models, both models indicated about 20% reduction in sterility by practicing deep-flood irrigation which place the panicle in the water in the sensitive period.
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