蔬菜和瓜类利用定植沟覆盖地膜,采用 “先盖天、后盖地”的方法(改良覆盖)可以收到早熟、丰产的效果。我们在生产实践中体验到这种方法在防寒效果上还不够理想,故从1988年开始,笔者进行了增加稻草苫覆盖来提高防寒(保温)效果的探索。并在地膜覆盖的方式上也作了改进,使蔬菜一直 Vegetables and melons use planting trenches to cover the plastic film. The method of “cover first and cover the ground later” (improved coverage) can receive premature and high yielding effects. We experience in production practice this method is not ideal in the cold effect, so from 1988 onwards, the author conducted an increase of straw 苫 coverage to improve the cold (heat) effect of exploration. And in the way of mulching also made improvements, so that vegetables have been