农田地膜覆盖，是我国近年来发展迅速的一项新兴高产栽培技术。使用农膜覆盖技术，不仅能有效地控制土壤的湿度和温度，减少水分和营养物流失，还能防止杂草生长，促使作物早熟增产，一般可增产20～40％。我国目前广泛使用的为低密度聚乙烯地膜。该膜稳定性极高，残留在土壤中 Film mulching of farmland is a new high-yielding cultivation technique developed rapidly in recent years in our country. The use of plastic film covering technology can not only effectively control the soil moisture and temperature, reduce the loss of water and nutrients, but also prevent the growth of weeds and promote the early maturity of crops, generally increasing the yield by 20-40%. China is currently widely used for low density polyethylene film. The film is extremely stable and remains in the soil