Liquid film mulching improved physical and chemical properties of soil. Liquid film was a kind of polymer mixture. It combined with soil particles and formed a black solidified membrane on the soil surface after adding water and spraying on the soil.

• 2 液体地膜覆盖改良土壤理化性状 液体地膜是高分子混合物，兑水喷施于土壤表面后，这些高分子与土壤颗粒相结合，在土壤表层形成一层黑色的固化膜。