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１０年定位试验研究结果表明，在长期施磷的条件下，陕西土耕层的磷素形态分布与该土壤性质一致。有机磷、无机磷在全磷中所占比例相对稳定，Ｃａ－Ｐ仍是无机磷的主要形态。３组Ｃａ－Ｐ的含量顺序是Ｃａ－Ｐ＿Ⅲ＞Ｃａ－ｐ＿Ⅱ＞Ｃａ－＿Ⅰ。Ａｌ－Ｐ含量增长较多，Ｆｅ－Ｐ含量相对稳定。１０年中施入土壤的磷素有４１．６％在耕层中转化为各种形态的矿质磷，其中Ａｌ－Ｐ、Ｃａ－Ｐ＿Ⅰ及Ｃａ－Ｐ＿Ⅱ的含量都与土壤有效磷含量呈极显著的相关关系。同时，有机磷含量与土壤有效磷也有显著的相关关系。化学磷肥是提供作物磷素营养、维持上壤磷素平衡的主要磷源。
The results of 10-year experimental study indicate that under the condition of long-term phosphorus application, the distribution of phosphorus forms in the soil layers of Shaanxi Province is consistent with that of the soil. Organic phosphorus, inorganic phosphorus in the proportion of total phosphorus is relatively stable, Ca-P is still the main form of inorganic phosphorus. The content of Ca-P in three groups was Ca-PⅢ> Ca-p_Ⅱ> Ca-_Ⅰ. Al-P content increased more, Fe-P content is relatively stable. In the past 10 years, 41.6% of the phosphorus applied to the soil was transformed into various forms of mineral phosphorus in the topsoil. The contents of Al-P, Ca-PⅠ and Ca-P_Ⅱ were all significantly different from the available phosphorus The relationship between. At the same time, organic phosphorus content also had a significant correlation with soil available phosphorus. Chemical phosphorus fertilizer is to provide crop phosphorus nutrition, phosphorus balance on the maintenance of the main phosphorus source.