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Hunan Province of China,lying in the centralof subtropical zone,is one of the major pro-duction areas of double-season rice.Rice pad-dy is the main agricultural soil of the area.Mixed samples of plough horizon（0-20cm）ofmajor types of paddy soils were collected be- fore cultivation in the spring of 1996-1997.The chemical fractions of inorganic phosphatesand the relationships between inorganic phos- phates and olsen-available P in the soils werestudied by using the fractionation system of in-organic phosphates proposed by JIANG Baifanet al.
Hunan Province of China, lying in the centralof subtropical zone, is one of the major pro-duction areas of double-season rice. Rice pad-dy is the main agricultural soil of the area. Mixed samples of plough horizon (0-20 cm) of major types of paddy soils were collected be-fore cultivation in the spring of 1996-1997. The chemical fractions of inorganic phosphates and the relationships between inorganic phos- phates and olsen-available P in the soils were staged by using the fractionation system of in-organic phosphates proposed by JIANG Baifanet al.