地膜覆盖是七十年代发展起来的农艺工程技术,一般是在早春低温时期,播后在地面覆盖一层透明聚乙烯塑料薄膜。这是一种投资少、见效快、收益大的新栽培技术,已在蔬菜等作物生产中广泛应用。实践证明,地膜覆盖不仅比不覆盖的地温平均提高2—4℃,使发芽期缩短5—8 Mulch is the development of agricultural technology in the seventies, usually in low temperature in early spring, after sowing on the ground covered with a layer of transparent polyethylene plastic film. This is a less investment, quick, high-yielding new cultivation techniques, has been widely used in the production of vegetables and other crops. Practice has proved that mulching not only than the average ground temperature is not covered by an increase of 2-4 ℃, the germination period shortened 5-8