我国５０年代末至７０年代中期，保护地农用覆盖材料主要应用聚氯乙烯（ＰＶＣ）农膜，８０年代以后随着树脂原料国产化水平不断提高，新树脂原料开发、加工工艺进一步改进，使农用覆盖材料进入全面开发的新阶段。传统材料被现代工业生产的农用覆盖材料所取代；农地膜覆盖... In the late 1950s and the mid-1970s, polyvinyl chloride (PVC) plastic sheeting was mainly used in farmland coverings in protected areas. With the continuous improvement of the localization of resin raw materials after the 1980s, the development of new resin raw materials and processing technology were further improved, Cover material into the new stage of full development. Traditional materials are replaced by modern industrial production of agricultural cover material;