First, to strengthen the coverage in the small shed buttoned arch shed, with thin bamboo poles and other arches, covering the film at night, covering the grass on the film; in the shed to cover the film, can increase temperature moisture. The use of plastic film as apron at the bottom of the shed can significantly reduce the cold air intrusion at the bottom; at the same time, attention should be paid to blocking the gaps in various places and minimizing gap heat dissipation. In the north of the greenhouse, straw is used as a windbreak to prevent wind and cold. Second, temporary warming When the greenhouse temperature during the day is less than 15 °C, the night temperature is lower than 5 °C, there may be cold damage or frost damage. Temporary warming measures should be taken at night to artificially supplement heat energy. Place several briquettes in the shed to increase the temperature inside the shed. However, attention should be paid to preventing carbon dioxide poisoning. When adding briquettes and removing coal stoves, greenhouses should be ventilated and enter people later. Third, to strengthen fertilizer management in the shed irrigation, in order to improve the soil and air humidity in the shed, there is a certain effect of cold, after irrigation, vegetables at -4 °C from frost damage. With rice vinegar, sugar, superphosphate mixed, dubbed 300 times liquid, sprayed on the foliage, increase the degree of sugar and hardness of mesophyll, and improve cold resistance. Drain the manure water in the shed so that the soil is not easy to freeze, so as to protect the seedlings and prevent cold. Fourth, to strengthen the prevention of diseases After the vegetables are frozen, they are susceptible to pests and diseases. So we must spray bactericidal agents such as chlorothalonil in time to prevent and control pests and diseases. Spreading wood ash on vegetables is equal to covering the vegetables, which can play a role in antifreeze and also play a role in preventing diseases. At the same time, a fumigant was placed in the shed to burn, killing bacteria in the shed. V. Management of Frozen Vegetables 1. Irrigation and Insulation: Irrigation can increase soil heat capacity, prevent ground temperature from declining, and stabilize surface air temperature, which is conducive to a steady rise in temperature and recovery of frozen tissue. 2. Ventilation and cooling: When the shed vegetables are frozen, the sheds cannot be heated immediately, and only the air is allowed to cool down, so that the temperature in the shed can rise slowly to prevent the temperature from increasing sharply and causing the frozen tissues to become necrotic. 3. Artificial water spray: Spraying water can increase the temperature of the air in the shed, stabilize the temperature of the shed, and can inhibit the evaporation of water from the frozen tissue and promote the water absorption of the tissue. 4. Cut off the dead branches: In time, cut frozen branches and leaves to avoid mildew induced by cold tissue. 5. Shelter shading: Put a awning in the shed to prevent the frozen vegetables from being directly exposed to sunlight, resulting in tissue loss and shrinkage and loss of vitality. 6. Make up the fertilizing material: After the frozen tissue is thawed, apply the available fertilizer in time. It can be sprayed with 2% urea solution and 0.2% potassium phosphate solution. 7. The use of hormones: After the plants are frozen, the growth of the plants is slow, and the new branches of new leaves are not developed. Spraying with exogenous plant hormones can be used to promote growth and accelerate the recovery of the body.
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