The results showed that lignin could help liberate the residual phosphate in soil.
结果表明：木质素对土壤残余磷具有明显的释放作用。
The released quantity of residual phosphate was opositively related to the content of clay and residual phosphate in soil, and the concentration of lignin in the extracting solution.
木质素用量越大，土壤粘粒越多，残余磷含量越高，木质素释放残余磷的数量越多。
Residual amounts of iron and aluminum dilute the phosphate content.
残采的铁铝降低了磷矿的含量。
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