Cultivation by covering with plastic film can effectively restrain the invalid evaporation of soil moisture, especially before the period of jointing. 覆膜栽培可有效抑制农田水分的无效蒸发，具有明显的抗旱增产作用。
When sometimes covered with film silican drum the water or steam, this is due to a large number of paper after absorption. 覆膜时有时会发现硅胶滚筒上有明显的水滴或蒸汽，这是由于纸张吸收了大量水分后导致的。
