The major loss was residual P and organic P Of the total lost, 52% was tYom residual P, whereas 16% originated from NaOH-po, Residual P and NaOH-Po, were the two most important resources of phosphorus in the rubber plantation tbr long term cultivation.

• 其中ResidualP和NaOH－Po的损失量最高，分别占全磷损失量的52%25和16%25，它们是长期耕作条件下热带胶园土壤磷两种最重要的有效磷源。