The climate has been warmer this winter, but with the cold air in recent days, temperatures have dropped and the cold has intensified. Therefore, vegetable farmers should do a good job in greenhouse insulation of cold vegetables, once the vegetables suffer freezing injury, it is timely to take the following measures to remedy.
After the shade and sunscreen have passed through the cold, the weather is generally fine and the sun is relatively strong. Therefore, it is necessary to build shades to prevent frozen vegetables from being exposed to strong light, causing dehydration and wilting of frozen tissue and loss of vitality, as well as death.
Spraying water in a shed can increase the air humidity, increase the air heat capacity in the shed, stabilize the temperature of the shed, and suppress the evaporation of water in the frozen tissue to promote water absorption.
In scientifically ventilated cold-shedding areas, horses cannot raise temperature, and if the temperature rises too fast, the frozen tissue will accelerate dehydration and cause plant death. It is also not possible to ventilate prematurely to prevent freezing damage from becoming worse. After the sun comes out, gradually open the vents, moderate air release, and slowly increase the temperature, so that the frozen tissue can fully absorb water and promote cell revival.
Watering water in time can increase soil heat capacity, prevent soil temperature from decreasing, and stabilize surface temperature.
Cut the frozen leaves and cut frozen leaves in time to prevent mildew from freezing.
After the foliar dressing of the frozen plants is slow, it is necessary to timely apply the available fertilizer and supplement the nutrition. Foliar spraying can be performed with 0.2% potassium dihydrogen phosphate solution and 2% urea solution.
After spraying plant growth regulators on greenhouse vegetables, the plants grew slowly and the new leaves and sprouts germinated slowly. Plant growth regulators can be sprayed to speed up body recovery and promote plant growth.
After the disease-preventing and insect-control plants are frozen, the stress resistance is weakened, and the pests and insects easily take advantage of it. Therefore, insecticides can be used, such as: phoxim pests. With aerosol, such as: chlorothalonil sterilization.
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