我们从1979年起在太原市郊区试验应用塑膜地面覆盖栽培大白菜,1981年推广到1,520亩,一般亩产可增加16—35.8%。三年试验证明,这是大白菜高产稳产的一项有效技术。好处是:1.节约用水。塑膜覆盖后阻止了地面水分蒸发,有明显的保墒作用,大白菜一生浇水可减少4次,每次浇水量减少1/3,大面积推广后,节约用水数字相当可观。2.减轻病害。覆盖的大白菜根系发达, We have been experimentally applying plastic film to cover the cultivation of Chinese cabbage since 1979 in the suburbs of Taiyuan City. In 1981, it was expanded to 1,520 mu. Generally, the yield per mu can increase by 16-35.8%. Three years of tests show that this is a high-yield cabbage is an effective technique. The benefits are: 1. Water conservation. Plastic film to prevent the evaporation of ground water after evaporation, there is a clear role of soil moisture, watering Chinese cabbage can reduce the life of 4 times, each time reducing the watering 1/3, after a large area of ​​promotion, water conservation figures are considerable. 2. reduce disease. Covered cabbage root well-developed,