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通过红壤性水稻土19 a肥料长期定位试验，结果表明，不施磷处理的土壤磷素处于耗竭状态，耕层土壤全磷含量持续下降，但耕层以下土层的全磷尚未耗损；连年施磷的土壤耕层全磷含量提高，提高的幅度呈现明显量级关系。在本试验条件下，土壤中各组分无机磷含量以Fe-P和O-P为主体，各占土壤无机磷总量的44.63%和31.27%；其次是Al-P和Ca10-P，分别占11.87%和8.01%，Ca2-P占3.52%；Ca8-P只有当土壤无机磷达到一定丰度和供磷强度时才存在，对水稻磷素营养的贡献无实际意义。各组分无机磷对水稻的有效性以Ca2-P>Al-P>Fe-P>O-P>Ca10-P；而对水稻磷素营养的贡献则以Fe-P>O-P>Al-P>Ca2-P>Ca10-P；长期耗磷或施磷、土壤各组分无机磷减少或增加量的排列顺序与土壤中各组分无机磷相对含量的顺序一致，从而保持红壤性水稻土无机磷组分相对含量的稳定。化学磷肥与有机肥配合施用，可以降低积累态磷转化为O-P和Ca10-P的比率。
The results of long-term fertilization experiments on 19-year fertilized paddy soils showed that phosphorus was depleted in the soil without phosphorus application and total phosphorus content in the topsoil continued to decrease. However, total phosphorus in the soil below the topsoil had not been depleted. Phosphorus soil plow level of total phosphorus increased, the magnitude of the increase showed a clear magnitude relationship. Under the experimental conditions, the contents of inorganic phosphorus in soil were mainly Fe-P and OP, accounting for 44.63% and 31.27% of the total inorganic phosphorus in soil, followed by Al-P and Ca10-P, accounting for 11.87 % And 8.01%, Ca2-P accounted for 3.52%. Ca8-P only existed when soil inorganic phosphorus reached certain abundance and phosphorus-supplying intensity, which had no practical significance to the contribution of phosphorus nutrition in rice. The inorganic phosphorus of each component had the effect of increasing Ca2-P> Al-P> Fe-P> OP> Ca10-P, while its contribution to phosphorus nutrition of rice was dominated by Fe-P> OP> Al-P> Ca2 -P> Ca10-P. The sequence of decreasing or increasing inorganic phosphorus content of all components in the soil was consistent with the order of inorganic phosphorus content of each component in the soil, so as to maintain the inorganic phosphorus content in the red paddy soil Points relative to the stability of the content. Chemical phosphorus and organic fertilizer with the application, can reduce the accumulation of phosphorus into O-P and Ca10-P ratio.