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。
Cultivation by covering with plastic film can effectively restrain the invalid evaporation of soil moisture, especially before the period of jointing.
灌溉量的增加，虽然提高了产量，却导致土壤水库中的水分不能被作物充分利用，造成了水分的无效蒸散浪费，降低了水分利用效率。
Although irrigation improved yield, crop under irrigation could not use the water of soil water reservoir. So irrigation made water waste uselessly and reduced WUE.
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