The relationship between soil moisture in various soil horizon and senescence, and irrigation efficiency of different irrigation scheme have been discussed.
文中还就不同层次土壤水分状况与衰老的关系及不同灌水方案的灌溉效益进行了分析。
The experiment studied the effects of residue used as surface mulch, mix with soil and a separate horizon in soil profile on soil water and salt movement.
本试验主要研究了作物秸杆表面覆盖、垂直覆盖（混施）和隔层对土壤水盐运动的影响。
The sewage soil disposal experiment is made mainly by using biochemical process of looser permeable soil horizon, and secondly by leaching and adsorption.
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。
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