棉茎秆、棉籽饼埋入土壤 ,当年可腐烂分解 68.1 4 %和 91 .2 7% ,氮磷化肥可明显促进棉茎秆的腐解速率 ;棉茎秆、棉籽饼腐烂分解后 ,其中的氮、磷、钾养分大部分可转变成作物能吸收利用的速效态养分 ;棉茎秆、棉籽饼埋入土壤经一年腐解后 ,腐殖化系数分别为 0 .2 85和 0 .1 4 0 Cotton stems and cottonseed cake were buried in the soil, decomposed 68.1 4% and 91.27% in the same year, nitrogen and phosphorus fertilizers could significantly promote the decomposition rate of cotton stem stalks. After the decomposition of cotton stalk and cottonseed cake, Most of nitrogen, phosphorus and potassium nutrients can be converted into quick-acting nutrients that crops can absorb and utilize. After one-year decomposition of cotton stems and cottonseed cake, the humification coefficients were 0.285 and 0. 1 4 0