2022 Fiscal Year Final Research Report
Soil degradation by cold water irrigation during cold season in dry lands: From the perspective of soil salinization and phosphorus leaching
| Project/Area Number |
20K05770
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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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| Review Section |
Basic Section 38010:Plant nutrition and soil science-related
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| Research Institution | Tottori University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
遠藤 常嘉 鳥取大学, 農学部, 教授 (70423259)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 乾燥地 / 灌漑農地 / 低温 / 塩の溶解度 / 土壌ソーダ質化 / 塩類土壌 / リン / 溶脱 |
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| Outline of Final Research Achievements |
The results of this study showed that the de-salinization process associated with cold water irrigation in dryland irrigated croplands promotes soil sodication process. This is due to the leaching inhibition of Na-carbonate, whose solubility decreases at low temperatures, and its residual in the soil. The results also suggest that the Na-Ca exchange reaction at low temperatures promotes the adsorption of Na ions on the soil. The quality and quantity of clay minerals in the soil were also significant factors in sodication process. Furthermore, soil sodication increased the solubility of soil inorganic phosphorus and the risk of leaching from agricultural lands.
Irrigation water in drylands contains bicarbonate ions, so irrigation with cold water during low-temperature periods poses a universal risk of soil degradation due to soil sodication and environmental impacts due to phosphorus leaching from agricultural land.
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| Free Research Field |
土壌学
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| Academic Significance and Societal Importance of the Research Achievements |
塩類動態について温度環境に着目しておこなった本研究で明確にできた乾燥地の灌漑農地における冷たい水による灌漑管理の負の側面，すなわちソーダ質化による土壌劣化とリン溶脱の問題は，大陸性気候下の乾燥地における冬季灌漑などの慣行的な灌漑管理を見直し，灌漑農業の持続性と環境の保全を高める対策に繋がる基礎的な知見になると期待できる．また，冷涼な雨季を持つ乾燥地の土壌生成，とくにソロネッツの生成に関する基礎的知見としての意味ももつ．
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