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从1989年引进北京第四塑厂生产的长寿棚膜在我区进行两年试验,初步证明使用长寿棚膜透光性、保温性、耐久性等均优于普通农膜。其对比试验结果与分析如下: 1.有较好的透光性使用长寿棚膜覆盖的日光温室内前、中、后各部位平均光照强度分别比普通农膜覆盖的日光温室内提高68001ux、52001ux、6000lux,充分显示了长寿棚膜有较好的透光性。 2.有较好的保温性
From 1989 to introduce the fourth plant in Beijing Changshou film production in our district for two years of trials, initially demonstrated the use of longevity film translucent, thermal insulation, durability are superior to ordinary agricultural film. The comparative test results and analysis are as follows: 1. There is a better translucency Greenhouse covered with long-life greenhouse in the greenhouse before, during and after the average light intensity of each part of the greenhouse than the ordinary plastic cover to raise 68001ux, 52001ux , 6000lux, fully demonstrated the long-life shed film has better translucency. 2 has a better insulation