大棚生产蔬菜具有极大的优越性,但由于一般农膜易于老化和不耐低温,只能使用3～4月就开始老化、破碎。补窟窿成了大问题。用聚氯乙烯粘合剂糊补,成本高,不好买,正常年景不遇冰雹每亩大棚需用粘合剂15公斤。麻烦的是,凡用粘合剂糊补的地方,20天以后又开始老化破碎,还得重补,更重要的是糊上粘合剂的地方,老化后变成黄疤,透光性差,影响光合作用,降低产量。我们试验用水糊补获得了良好的效果。具体做法如下: Greenhouses produce vegetables with great superiority, but because of the general plastic sheet is easy to aging and intolerance of low temperature, can only use 3 to 4 months began to age, broken. Complement hole into a big problem. Polyvinyl chloride adhesive paste make up, high cost, not good to buy, the normal annual case of hail per acre shed need adhesive 15 kilograms. The trouble is that where the adhesive paste make up the place, after 20 days and began to age broken, have to make up, more importantly paste the adhesive place, after aging into a yellow scar, poor light transmission, Affect photosynthesis, reduce production. We test the water paste made good results. Specific practices are as follows: