| Project/Area Number |
16K07953
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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 |
Rural environmental engineering/Planning
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| Research Institution | National Agriculture and Food Research Organization |
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Principal Investigator |
Mochizuki Hidetoshi 国立研究開発法人農業・食品産業技術総合研究機構, 西日本農業研究センター, 上級研究員 (30403372)
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
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| Keywords | 水稲 / 乾田直播 / 湿害 / 出芽不良 / 土壌 / 地下水位 / 水移動 / ロジスティック曲線 / ロジスティックモデル / 土壌物理性 / 透水性 / 通気性 / 苗立ち / 透水係数 / 水分特性曲線 / 水ポテンシャル / 農業工学 / 土壌学 / 植物 |
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| Outline of Final Research Achievements |
We conducted laboratory and field experiments to clarify the effect of soil, ground water level, and direction of water movement on wet injury of rice, by using rice cultivar “Akebono”. As a result, higher ground water level made the germination retarded more and final germination rate lower. As for the soil, the gray lowland soil and the Shikoku paddy soil showed the significant retardation of the germination and the low final germination rate. On the direction of the water movement at the ground water level of 0cm, the downward flow decreased the final germination rate most. These results were confirmed both in the laboratory and field experiments. Therefore, it is suggested that the paddy soil tends to occur the wet injury of rice, and high ground water level and a long-term rainfall would encourage it.
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| Academic Significance and Societal Importance of the Research Achievements |
当該研究の成果は、土壌物理的条件を制御することによって、乾田直播水稲の出芽不良（湿害）の発生条件を具体的に示した点にある。とりわけ、水田土壌が湿害を助長するリスクが高いことを示した点は、意義が大きい。また、これらの成果は、農林水産省が発表した食料・農業・農村計画に示された水稲の多収・省力栽培技術の一翼を担うと考えられる乾田直播栽培における、圃場選びや圃場管理、土作り等の指標の明示に繋がり、これに基づく農作業の効率化・省力化が期待されるため、社会的な意義も大きい。
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