First, indoor heating 1. When the outside world cools down significantly, firewood or coal can be temporarily used for combustion, and the room temperature can be increased through the stove, flue, and direct heat dissipation. 2. Hot water, hot air and steam discharged from wineries, paper mills, smelters, etc. can be used as a heat source for greenhouses where conditions permit. 3. Increase the application of hot organic fertilizer, that is, before planting vegetables, bury 5 to 10 centimeters thick semi-mature hot organic fertilizer (such as horse dung, donkey dung, sheep dung, etc.) in the depth of 10 to 15 cm below the ground. ). Second, outdoor insulation 1. Set up a windbreak around the greenhouse to reduce wind speed. 2. Soil around the greenhouse to increase the thickness of the greenhouse wall. 3. Dig out the cold-proof ditch around the greenhouse, fill the ditch with slag, rice husk, etc., cover the top of the ditch and keep the ditch dry. 4. Increase the cover of the greenhouse, such as thick grasshoppers (curtains). 5. Do a good job in the connection and caulking of various parts of the greenhouse to prevent intrusion of cold winds. 6. Try to fight for longer lighting time. As long as you can shine in the sun, you should immediately remove the cover of the grasshopper (curtain). Third, indoor insulation 1. Take plastic film covering, buckle small arch shed, moving screen surface and other multilayer covering methods to keep warm. 2. Add a multilayer grasshopper (curtain) on the inner side of the greenhouse to prevent wind and heat. 3. Install a fluorescent lamp in the greenhouse (the lamp is kept at a distance of 50 cm from the leaves of the plant) and light is irradiated for 10 to 12 hours per day. 4. Set the workroom at one end of the greenhouse, and hang thick curtains at the entrance and exit to prevent cold wind from intruding. 5. Cover with no drip film. Fourth, fertilization antifreeze Timely application of foliar potassium dihydrogen phosphate, rare earth micronutrients, and spraying of fertilizers on greenhouse vegetables and other crops, as well as the application of carbon dioxide, can not only promote the increase of yield, but also can significantly increase the resistance of vegetables to low temperature chilling. Squid Head Squid Head,Calamari Heads,Cuttlefish Head,Head Squid ZHEJIANG EVERNEW SEAFOOD CO.,LTD , https://www.evernewseafood.com