多年多点试验示范表明：渗水地膜覆盖玉米增产效果显著，主要表现为单株生产力的提高，在年均积温较小的地区增产幅度大。
The test results in different places and in many years showed that there was a striking increase, covered by water permeability plastic film in maize yields than conventional film and than no cover.
结果表明，地膜覆盖在玉米生育中期保水效果明显，而在生育前期和后期保水效果不明显；
The results showed that the film covering had obvious effect on soil water conservation at the middle stage of corn growth, but neither at the earlier, nor later stage was obvious.
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