The results were as follows:Compared with conventional flooded paddy soils, rain fed and mulching plastic film slightly reduced bulk density, increased total porosity of the soils.
与常规水作相比，覆膜旱作稻田土壤容重有所下降，总孔隙度增加显著；
This paper deliberated on the status of pollution brought by chemical fertilizer, pesticides and mulching plastic film, and according to each problem the corresponding treatments were put forward.
分析和探讨了化肥、农药及地膜对我国农田环境的污染状况，提出了控制农业自身污染的对策。
There was no significant difference of rice grain yields between the treatments of straw mulching and plastic film covering but the cost and soil pollution in the latter should be concerned.
覆膜处理虽在产量和水分利用效率上略高于盖草处理，但差异不显著，且覆膜处理存在成本高，污染土壤等缺陷。
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