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水溶性磷肥施入土壤后，其有效性随时间延长而降低，短期内（２个月）有２／３左右变成不可提取态磷（Ｏｌｓｅｎ）法，其形态主要是Ｃａ８—Ｐ，Ａｌ—Ｐ，Ｆｅ—Ｐ型磷酸盐。在种植玉米时，施入的磷肥２２．６—２７．８％转化成Ｃａ２—Ｐ，２７．５—３０．６％转化成Ｃａ８—Ｐ，９．１—１０．０％转化成Ａｌ—Ｐ，１０．５—１５．６％转化成Ｆｅ—Ｐ，１１．３—１８．８％被玉米吸收利用。Ｃａ２—Ｐ、Ｃａ８—Ｐ、Ａｌ—Ｐ和Ｆｅ—Ｐ型磷酸盐对玉米生长都有一定的肥效，它们对植物干物质生产的效率（即引入每百毫克磷所产生的植株干重）的大小顺序是：Ｃａ２—Ｐ＞Ａｌ—Ｐ＞Ｃａ８—Ｐ＞Ｆｅ—Ｐ。Ｃａ（１０）—Ｐ型磷酸盐对玉米生长无效。
The effectiveness of the water-soluble phosphate fertilizer applied to the soil decreased with time, short-term (2 months) about 2/3 into non-extractable phosphorus (Olsen) Act, the main form of Ca8-P, P, Fe-P-type phosphate. When corn is planted, the phosphate fertilizer applied is converted into Ca2-P by 22.6-27.8%, converted to Ca8-P by 27.5-30.6%, converted to Al-P by 9.1-10.0% , 10.5-15.6% into Fe-P, 11.3-18.8% is absorbed by corn. Ca2-P, Ca8-P, Al-P, and Fe-P-type phosphates have some effect on maize growth and their effect on plant dry matter production (ie, the introduction of dry weight per plant produced by 100 mg phosphorus) The order of magnitude is: Ca2-P> Al-P> Ca8-P> Fe-P. Ca (10) -P type phosphate is ineffective on corn growth.