采用顾益初、蒋柏藩提出的石灰性土壤无机磷分级方法，研究了施肥对土壤无机磷形态组成的影响。结果表明：①施用含磷肥料（化肥或有机肥），均可显著地增加Ｃａ＿２－Ｐ、Ｃａ＿８－Ｐ、Ａ１－Ｐ和Ｆｅ－Ｐ的含量，其中钙磷增量约为铁铝磷的２倍；②Ｃａ＿（１０）－Ｐ和Ｏ－Ｐ在短时间里是不能生成的。旱地长期施用化学磷肥，可明显地提高Ｏ－Ｐ和Ｃａ＿（１０）－Ｐ的含量；③长期施用含磷肥料，除被作物吸收利用外，残留在土壤中的无机磷，约有６０％以上是以有效磷源存在的。 The method of grading inorganic phosphorus in calcareous soil proposed by Gu Yichu and Jiang Baofan was used to study the effect of fertilization on the composition of inorganic phosphorus in soil. The results showed that: ①The content of Ca_2-P, Ca_8-P, Al-P and Fe-P could be significantly increased by applying phosphorus fertilizer (chemical fertilizer or organic manure) Times; ②Ca_ (10) -P and O-P can not be generated in a short time. Long-term application of chemical phosphate fertilizer in the dry land can obviously increase the contents of O-P and Ca_ (10) -P; ③ Long-term application of phosphorus-containing fertilizers not only absorbs and uses crops, but also leaves more than 60% Is available as a source of phosphorus.