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通过对长期定位试验的研究测定，研究了盐渍土培肥过程中土壤磷素的收支平衡以及磷素累积及其形态。同时．探讨了盐渍土的磷肥利用率。结果表明；通过长期培肥特别是施用磷肥．土壤含磷量有较大幅度的提高．其中大量的磷素被转化为无效的Ca10－P，占无机磷总量的48％。而提高氮肥使用量，合理氮磷配比．有助于降低无效态的Ca10－P的比例。同时．表明作物对磷的需求能力并不因磷肥投入量增加而增加．在一定施磷水平以上，磷肥的利用率随磷肥投入量的增加而下降；合理氮磷配比，提高作物产量，有助于磷肥利用率的提高。
Through the research of long-term experiment, the balance of phosphorus in soil and the accumulation of phosphorus and its morphology were studied. Simultaneously. The utilization of phosphate fertilizer in saline soil was discussed. The results show that: through long-term fertilization, especially the use of phosphate fertilizer. Soil phosphorus content is more substantial increase. A large amount of phosphorus is converted to ineffective Ca10-P, accounting for 48% of the total inorganic phosphorus. And increase the amount of nitrogen fertilizer, a reasonable ratio of nitrogen and phosphorus. Helps to reduce the ineffective Ca10-P ratio. Simultaneously. This shows that the demand for phosphorus in crops does not increase due to the increase in input of phosphate fertilizer. Above a certain level of phosphorus application, the utilization rate of phosphate fertilizer decreased with the increase of phosphate fertilizer input. Reasonable ratio of nitrogen and phosphorus could improve crop yield and contribute to the increase of phosphate fertilizer utilization rate.