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1 怎样延长保护地塑料薄膜的使用寿命? 目前吉林地区保护地生产使用的塑料薄膜多数是吉林市塑料厂生产的聚氯乙烯拉幅无滴蔬菜大棚膜,厚度0.12mm,每kg约2.2m,每kg13～14元,使用时间一年。塑料大棚膜老化的快慢与高温日晒时间的长短和钢架是否用草绳缠好关系密切。塑料在低温无日晒条件下老化的很慢。保护地经济效益一般秋茬远不如春茬高。根据市场导向和塑料的特性,
1 How to prolong the service life of plastic film in protected areas? At present, most of the plastic films used in the production of protected areas in Jilin are polyvinyl chloride tenterless drip-proof vegetable greenhouses produced by Jilin Plastic Factory. The thickness is 0.12mm, about 2.2m per kg, Each kg13 ~ 14 yuan, the use of time for one year. Plastic greenhouse film aging speed and temperature of the sun and the time the length of the steel rope wrapped with straw closely related. Plastic in the low temperature sunless conditions aging very slowly. Economic benefits of the general fall farmer autumn stubble far better. According to market-oriented and plastic characteristics,