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由于地膜覆盖显著的增温保墒作用,明显地改善了农田生态环境,从而可达到以下几方面的突出效果。一是大幅度增加作物产量,可实现增产30%~80%。二是作物种植区域扩大。可使作物适宜种植区的临界纬度向北推移2~4°,过去不能成熟的作物不仅能够成熟、而且可达到高产。三是品种布局明显扩大。部分高海拔山区,过去只能种植生育期短的早熟品种,种中晚熟品种不能成熟,而覆膜后中晚熟品种也可成熟了。四是提高了复种指数。北方一些地区过去一年一季有余、两季不足,应用地膜覆膜后可达到两
As the plastic film mulching significantly warming the role of soil moisture, significantly improve the ecological environment of farmlands, which can achieve the following outstanding results. First, a substantial increase in crop yields, can achieve an increase of 30% to 80%. Second, crop planting area expanded. The critical latitude of crop suitable planting area can be shifted north by 2 ~ 4 °. In the past, crops that could not mature could not only mature but also achieve high yield. Third, the variety of layout significantly expanded. Some high-altitude mountain areas, in the past only the cultivation of short-maturing varieties of early maturing varieties can not mature, and the maturity of medium and late maturing varieties can also be matured. Fourth, raise the multiple cropping index. Some areas in the northern part of the past year more than a quarter, two quarters of shortage, the application of plastic film can reach two