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经过对半干旱地区降水分布规律的调查和农田生产的实践发现，天然降水中＜１０ｍｍ／次的发生频率占到７０％左右，这部分水极易被蒸发掉，多为无效降水。为了提高干旱与半干旱地区以小雨量资源利用率为核心的降水资源利用率，我们研制出了渗水地膜（专利号９７１１５７６１·８），在山西省１９９７年大旱发生年进行的多点试验示范证明：渗水地膜覆盖可以起到渗水、保水、增温、调温和微通气等多种功能，显著地提高了小雨量资源利用率和旱地农作物产量。这项技术可促进广大干旱与半干旱地区旱地农作物产量的提高。
After the investigation of the distribution of rainfall in semi-arid areas and the practice of farmland production, it is found that the occurrence frequency of <10mm / times in natural precipitation accounts for about 70%, and this part of water is easily evaporated, mostly for ineffective precipitation. In order to improve the utilization of precipitation resources in the arid and semi-arid areas with the utilization rate of light rainfall as the core, we developed the seepage-proof plastic film (Patent No. 97115761.8) It is proved that water seepage film mulching can play a variety of functions such as water seepage, water retention, temperature increase, temperature control and micro-aeration, significantly improving the utilization rate of light rainfall and crop yield in dry land. This technology can promote the production of crops in drylands in arid and semi-arid areas.