结果表明：木质素对土壤残余磷具有明显的释放作用。
The results showed that lignin could help liberate the residual phosphate in soil.
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。
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.
中国古土壤现分为埋藏土和残余土两大类。
Paleosols of China are divided into buried and relict soils.
在深层土壤中，氧化物结合态、有机结合态和残余态3种形态的金属萃取效果降低，可能与EDTA浓度降低有关。
In deep soils, oxides bound, organic bound and residual forms of state 3 kinds of metal extraction efficiency decrease may be related to the decreased concentration of EDTA.
如果有必要，我们可以做到把土壤中重金属和农药残余物的含量，降低到几乎为零的水平。
If necessary, the residue of pesticides and heavy metals in artificial soil can be reduced close to zero.
如果有必要，我们可以做到把土壤中重金属和农药残余物的含量，降低到几乎为零的水平。
If necessary, the residue of pesticides and heavy metals in artificial soil can be reduced close to zero.
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