农用塑料薄膜,简称农膜,在农业现代化生产中,发挥着越来越大的作用。它将同化肥、农药一样,成为不可缺少的生产资料。用农膜扣棚生产蔬菜,可提早成熟,延后生长,提高产量。在其它农林业生产上,也广泛应用。目前,生产和应用的农膜有聚乙烯和聚氯乙烯两种,现在简单介绍一下它们的优缺点,供选用参考。聚氯乙烯的主要原料是煤、石灰石和玉米,聚乙烯的主要原料是石油。聚 Agricultural plastic film, referred to as plastic sheeting, plays an increasingly important role in the agricultural modernization. Like fertilizers and pesticides, it will become an indispensable means of production. Production of vegetables with plastic sheeting shed can be premature, delayed growth and increase production. In other agricultural and forestry production, but also widely used. At present, the production and application of plastic sheeting are two kinds of polyethylene and polyvinyl chloride, and now briefly introduce their advantages and disadvantages for the selection of reference. The main raw material of PVC is coal, limestone and corn, the main raw material of polyethylene is petroleum. Poly