Sulfur fertility dynamics in paddy soil and its control mechanism
| Project/Area Number |
17K07694
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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 |
Plant nutrition/Soil science
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| Research Institution | Tohoku University |
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Principal Investigator |
Kanno Hitoshi 東北大学, 農学研究科, 准教授 (30250731)
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Keywords | 水田土壌の硫黄肥沃度 / 可給態硫黄 / 可溶性金属 / 難溶性硫化物 / 土壌肥沃度 |
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| Outline of Final Research Achievements |
In order to determine the soil factors related to sulfur (S) deficiency in paddy rice, S fertility dynamics of paddy soil and its control mechanism were investigated. According to the pot experiments using 17 paddy soils conducted for 3 years and the previous results, it was suggested that the quantitative relationship between the available S in soil and the possible formation of insoluble sulfide produced by soil reduction control the S fertility of paddy soil. Consequently, we proposed the model in which metal sulfides formation with different solubilities regurate the S supply capacity of paddy soil. The results of a wide-area evaluation of soil available S in Iwate and Hiroshima prefectures suggest that the growth suppression of paddy rice due to S deficiency is not special and that measures based on soil diagnosis are necessary.
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| Academic Significance and Societal Importance of the Research Achievements |
近年，各地で水稲の硫黄(S)欠乏が報告されているが，S供給力に関する土壌分析は殆ど行われていないのが実態である。今回提案した土壌S供給力の制御モデルを用いることにより，水田土壌のS肥沃度を精度良く評価することが可能となった（学術的意義）。また，岩手県と広島県を対象に行った可給態Sの広域評価及び定点調査試料を用いた検討結果は，水田におけるS肥沃度管理の不備について問題提起するものであり，社会的意義は大きいと確信する。
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Report
(4 results)
Research Products
(13 results)
