Mechano-chemical analysis of fluctuation range of paddy soil structure due to wet and dry cycle
| Project/Area Number |
23380136
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Rural environmental engineering/Planning
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
TAKAHASHI Tomoki 農業・食品産業技術総合研究機構, 東北農業研究センター, 主任研究員 (00355562)
NISHIDA Kazuhiro 東京大学, 大学院農学生命科学研究科, 助教 (90554494)
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| Co-Investigator(Renkei-kenkyūsha) |
NAKANO Keiko 農業・食品産業技術総合研究機構, 九州沖縄農業研究センター, 主任研究員 (40354089)
SUZUKI Katsuhiro 農業・食品産業技術総合研究機構, 中央農業総合研究センター, 主任研究員 (90354068)
ODAHARA Koji 福岡県農業総合試験場, 筑後分場, 専門研究員 (10514995)
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| Project Period (FY) |
2011-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2011: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
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| Keywords | 水田土壌 / 土壌構造 / 膨潤収縮 / 酸化還元 / 粘弾性的挙動 / 土壌の膨潤収縮 / 亀裂 / ポロシメトリ / 遊離酸化鉄 / レオロジー / 土壌の収縮 / 土壌の膨潤 / 保水性 / 土壌の物理性 / 土壌の化学性 / 土壌の保水性 / 粘質土 / 収縮膨潤 / 粘弾塑性 |
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| Outline of Final Research Achievements |
Fluctuation range of swelling/shrinkage volume and pore-size distribution of paddy soil due to continuous application of organic matter or redox treatments is studied for the undisturbed and air-dried soil samples. Although the application of organic matter increased the fluctuation range of redox potential under the rotational cultivation of rice and wheat, the influence on the swelling/shrinkage characteristics was exclusively revealed for the air-dried disturbed soil. Even under the stable soil water potential, the volume ratio and volumetric water ratio temporally increased as the progress in soil reduction. Pore size distribution shifted upward by the reduction treatment and converged into narrow pore-size range by the remixing. Visco-elastic modeling is found to be effective in the analysis of selling /shrinkage of paddy soil under the influence of alternating redox condition.
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Report
(5 results)
Research Products
(8 results)
