In calcareous soil the water soluble phosphate applied was mainly transformed into Ca P,O P and Al P, which in acid soil were mainly changed into Fe P, O P and Al P.Submerg increased Fe P in both soils.

• 外加磷肥在潮土中主要转化为Ca?P，O?P和Al?P，红壤中则主要转化为Fe?P，Al?P和O?P。