Strengthen management. 1) vegetable greenhouse production management process must strengthen the management of light, in favor of thermal insulation provided by the wholesale, exposing the cover as soon as possible, common light. 2). Adding carbon dioxide. Application of carbon dioxide fertilization, increased levels of carbon dioxide, but also help enhance the plant's resistance to cold. 3) It should be noted vegetable blight, gray mold incidence and spread. Variation of greenhouse air humidity: plastic film closed strong, the greenhouse air with outside air exchange hampered industrial insulation, soil evaporation and transpiration of water vapor foliage difficult diverge. Therefore, shed humidity. Insulation was daytime, under greenhouse ventilation, air shed 70-80% relative humidity. After the rainy days or irrigation of up to 90%. Greenhouse air relative humidity decreases as the temperature increases, often to 100% at night. Shed after cold wet air condenses into water film or droplets attached to the inner surface of the film or plants. Insulation been purposes, Liaoning insulation, Canton St. agricultural machinery provided by the Canton of St. Shouguang Agricultural Machinery Co., Ltd .. Shouguang City, Canton St. Agricultural Machinery Co., Ltd. (www.sdguangsheng.com) strong, credible, Weifang in Shandong agricultural machinery industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the broad St. agricultural machinery and you hand into the brilliant, for a better future!