At present, most of the vegetables grown in greenhouses have been planted. To prevent the plants from freezing at night, the following measures can be taken:
First, the greenhouse can be insulated with multiple layers of covering, and conditions can also be covered with straw, non-woven fabrics, shade nets and so on.
Second, to strengthen the greenhouse, tighten the greenhouse film line. Increase phosphorus and potassium foliar fertilizers to cultivate robust seedlings. In the rain and snow days, when the plants have a process of gradually seeing light and slowly warming up, they cannot suddenly unveil the grass curtains, causing the plants to die of rapid wilting and withering, resulting in undue losses.
3. Minimize watering and fight drugs to reduce greenhouse moisture. Use water under the membrane as much as possible, use fumigant when spraying, and use less spray.
4. For vegetables that have suffered different degrees of cold injury and cold injury, before spraying on sunny days, they can spray fresh water on the leaves first, slowly increase the temperature, slowly increase the time for light exposure, and stop wilting after a severe cloudy period. The plants must undergo major nutritional adjustments to promote new shoot growth.
Fifth, take temporary warming measures to artificially supplement heat.
(1) Open flame heating method: When the indoor temperature drops too fast and will cause freezing damage, it can be heated by open flame. The open fire heating should be selected dry, smoke less firewood. The fire point should be away from the plant to prevent burns. The fire method should be slowly warmed up. Do not raise the temperature too fast. Normally, the temperature can be increased to about 8°C at night, and heating can be stopped.
(2) Heating of electric heaters: Solar greenhouses with power conditions can be heated by electric heaters to supplement heat and increase the temperature of the greenhouse.
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