In winter, cold waves occur frequently, and improper management of vegetables in greenhouses can be easily chilled. Once it is frozen, it should be promptly remedied to reduce disaster losses.
1. Cut off dead branches. The frozen stems and leaves are cut off in time to prevent tissue damage and induce disease.
2. Artificial water spray. Vegetables in greenhouses - Once frozen, spray water on the vegetables in the shed to increase the air humidity in the shed to stabilize the temperature in the shed and suppress the dehydration and volatilization of the frozen tissue of the vegetables to promote the water absorption of the frozen tissue.
3. Let the wind cool. After the crop is frozen, it cannot be immediately heated in a closed greenhouse. Only the air is allowed to cool, so that the temperature in the greenhouse can slowly rise, and the frozen tissue can absorb sufficient water for dehydration due to freezing. This will promote cell activation and reduce tissue necrosis.
4. Shed shade. Shed the shade in the shed to prevent the frozen crop from direct sunlight and reduce the degree of dehydration in the frozen tissue.
5. Make up fertilizer material. After the frozen plants are thawed, the fertilizer can be applied quickly. Spray the foliage with 2% urea or 0.2% potassium dihydrogen phosphate solution.
6. Prevent diseases. After the plants are frozen, the disease is easy to take advantage of. Sprinkle some protective pest control agents in time, such as 80% mancozeb 500 times solution, 50% prussenoside 1000 times solution, 64% antivirus pot, etc., and Tianda 2116 co-administer better. At the same time, a fumigant was placed in the shed to burn, killing bacteria in the shed.
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