提高塑料大棚效益的几种方法１．双层保温。用单层塑料薄膜覆盖大棚保温，往往达不到蔬菜生长发育所需最佳温度。如能在大棚内加盖地膜或盖小拱棚，进行双层保温，可收到良好的效果。２．采用无滴薄膜。用一般农用塑料覆盖大棚，容易在膜面上形成水滴，既影响透光率，又影... Several ways to improve the efficiency of plastic greenhouse 1. Double insulation. Single-layer plastic film covered greenhouse insulation, often fail to reach the optimum temperature for vegetable growth and development. If you can add a plastic film in the shed or cover small shed, double insulation, can receive good results. 2. No drip film. Cover with general agricultural plastic greenhouse, easy to form water droplets on the membrane surface, both affect the light transmittance, but also ...