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双层保温：采用双层保温措施，即在大棚内加盖地膜或设置小拱棚，可以收到良好的效果。据试验，在大棚内加盖地膜，能使地温提高２℃；在大棚内设置小拱棚，可使小拱棚内的温度保持在１５℃以上。设置反光幕：在蔬菜大棚的北侧弱光处置一道反光幕，能显著增强蔬菜大棚北侧的光
Double insulation: The double insulation measures, namely in the greenhouse affixed film or set a small shed, you can receive good results. According to the test, the plastic film is affixed in the greenhouse, so that the ground temperature can be increased by 2 ° C; and the small shed can be set in the greenhouse to keep the temperature in the small shed above 15 ° C. Set the reflective screen: weak light in the northern side of the vegetable greenhouse to dispose of a reflective screen, can significantly enhance the north side of the vegetable greenhouse light