:1999年在通榆县科技示范区 ,进行了打瓜覆膜试验研究。结果表明 :在 0～ 10cm土层中 ,覆膜比未覆膜温度增加 5℃左右 ,含水量平均提高 50 5% ,从而使土壤中速效性养分含量有明显提高 ,盐基总量却明显下降 ,因此 ,覆膜比未覆膜早熟 33d ,公顷纯收入比未覆膜栽培多 2 973元 ,取得了明显的经济效益 : In 1999 Tongyu County Science and Technology Demonstration Zone, conducted a melon film test study. The results showed that in 0 ~ 10cm soil layer, the temperature of coating increased about 5 ℃ and the water content increased by 50.5% on average, so that the available nutrient content in soil increased obviously and the total amount of base decreased significantly Therefore, compared with the uncoated film, the net income of the film was 33.9 yuan more than that of the uncoated film, and the net income of hectare was 2 973 yuan more than that of the uncoated film, which showed obvious economic benefits