Since the middle of 1970s, the polyethylene film is adapted in the planting vegetable shed in China. The property of normal LDPE film is poor in weather resistance and mantaining temperature. When LDPE film was covered the shed, a great deal of waters were condensed in the surface of film and the transparency of film was decreased. It is disadvantage for the growthing of crop and it can cause the crop diseases when the water drops fall on the leaf surface.
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