Fractionation of inorganic phosphorus in purplish paddy soils under different farming practices was carried out. The results show that formulated application of organic manure and chemical fertilizers may facilitate transformation of phosphorus into available forms. Its contribution to soil available P pool varies with the kind of manure used. in the sequence of pig manure > chemical fertility > control > green duckweed > horsebean. The effects of farming practices on availability of various phosphorus farms are significant. They are in the order of water-drought rotatatio > non-tillage ridge in a field > routine tillage. The contents of various forms of P are closely related to soil fertility.
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马红亮,高明,魏朝富.农艺措施对紫色水稻土无机磷形态的影响[J].土壤,2003,35(3):248-254. Ma Hongliang, Gao Ming, Wei Chaofu. EFFECT OF AGRONOMIC MANAGEMENT ON FORMS OF INORGANIC PHOSPHORUS IN PURPLE PADDY SOIL[J]. Soils,2003,35(3):248-254