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- W2363679571 abstract "Phosphorus (P) in surface runoff from agricultural soils is a contributor to accelerated eutrophication in surface water. The sustainable management of chemical fertilizer and manure to minimize freshwater eutrophication requires identifcation of soil P levels that exceed crop P requirements and have the potential for P loss. The relationship between water soluble P (0.01 mol·L-1 CaCl2 extractable P) and agricultural test P (Olsen-P and Bray 1-P) and phosphorus sorption saturation were researched in three groups of paddy soils with different soil texture. 139 soil samples were analyzed by Olsen P, Bray 1-P and water soluble P in both aerobic and anaerobic conditions. Soil P sorption saturation was calculated as a function of oxalate extractable P, Fe and Al. Thresholds in the relationships between water soluble P and Olsen-P, Bray 1-P and P sorption saturation were identied by segmented linear regression (change point analysis). The thresholds for Olsen P, Bray 1-P and P sorption saturation for the paddy soils were 50~75 mg·kg-1, 90~140 mg·kg-1 and 21%~23% under the aerobic condition, and 35~45 mg·kg-1, 75~115 mg·kg-1 and 16%~18% under the anaerobic condition, above the thresholds the potential of P release from the paddy soils to water increased. These threshold values may be of environmental importance in estimating the potential of soluble P loss from paddy soil by drainage and leaching." @default.
- W2363679571 created "2016-06-24" @default.
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- W2363679571 date "2006-01-01" @default.
- W2363679571 modified "2023-09-28" @default.
- W2363679571 title "Environmentally Sensitive Thresholds of Phosphorus of Paddy Soils" @default.
- W2363679571 hasPublicationYear "2006" @default.
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