Abstract: In this paper, a pot experiment was conducted to plant winter wheat on four phosphorus levels of aquic soil combined with rape green fertilizer, organic fertilizer and corn straw. The contents of inorganic phosphorus components in soil before planting and after harvest of winter wheat were determined by Gu Yichu-Jiang and Baifan method, and the effects of organic materials on the transformation of inorganic phosphorus components in aquic soil were studied. The results showed that the content of inorganic phosphorus increased significantly with the increase of phosphorus application rate, the content of inorganic phosphorus in organic materials increased at different phosphorus levels except for the decrease of Fe-P, the content of other inorganic phosphorus components increased, and the increase of organic materials reduced the proportion of soil Ca₁₀-P. Soil available P was positively correlated with Ca₂-P, Ca₈-P and Al-P(P<0.01). Path analysis showed that the direct contribution order of all forms of inorganic phosphorus to available phosphorus was Ca₂-P>Al-P>Ca₈-P>O-P>Ca₁₀-P>Fe-P, indicating that codomain Ca₂-P was the main available phosphorus source. Compared with P fertilizer alone, P fertilizer combined with organic materials significantly increased the yield and above-ground P content of winter wheat.

Key words: phosphate fertilizer, organic materials, inorganic phosphorus component