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正确选用棚膜是搞好大棚蔬菜生产的重要一环。目前市场上出售的棚膜大体分４类，即无滴膜、有滴膜、复合膜和紫光膜。下面分别介绍如下： 一、无滴膜（聚氯乙烯膜） 棚内温度高、光照好、病害轻是棚菜高产高效的先决条件。使用无滴膜覆盖后，棚膜内面水滴能顺斜面流下，膜下无
Proper selection of greenhouse film is an important part of greenhouse vegetable production. Currently sold on the market generally divided into four types of film, that is, no dripping film, a drop film, composite film and purple film. The following were introduced as follows: First, no drip film (PVC film) shed temperature, light, light is a greenhouse vegetables high yield and efficiency of the prerequisite. After using the drip-free film to cover, the water droplets inside the film can flow down the ramp, without membrane