污水土壤处理试验，主要是利用透水性较强的土壤层的生物化学作用，其次是淋滤吸附。
The sewage soil disposal experiment is made mainly by using biochemical process of looser permeable soil horizon, and secondly by leaching and adsorption.
随着耗竭试验的继续，各处理土壤磷库含量都呈下降趋势。
Following with the exhaust test, the content of soil phosphorus storage of each treatment showed a declining tendency.
通过田间试验研究了返青期不同程度根修剪处理对冬小麦群体结构、土壤水分及产量形成的影响。
A field experiment was conducted to study effects of root pruning at returning green stage on population structure, soil water and yield formation of winter wheat.
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