Topdressing quick-acting fertilizers: After the frozen vegetables are recovered, the available nitrogen fertilizers and phosphorus and potassium fertilizers can be topdressed in time to promote the recovery of the vegetable plants. Before low temperature, 0.2%-0.3% potassium dihydrogen phosphate solution can be sprayed 1-2 times to increase the cold resistance, or 400-500 kg of thin human and animal manure and water per acre, which can reduce the icing degree of the soil and reduce the freezing injury. Spreading 50-100 lbs of fire-soil ash or plant-soil ash between the compartments of the vegetable can not only prevent cold and prevent freezing, but also play a role in increasing potash fertilizer, and has a good effect on the control of root rot of cruciferous vegetables.
Spraying fresh water or suppressing steaming agent: After 2-3 days of light frostbite, the greenhouse vegetables and seedlings shall be shaded for a short period of time before and after noon to avoid sudden loss of water due to strong light. According to the humidity condition, a small amount of fresh water is sprayed at noon to increase the surface temperature and humidity, inhibit the dehydration and drying of the frozen tissue, and promote the absorption of frozen tissue. In the 3-4 days before the onset of the cold wave, sunny day sprayed 30-40 times petroleum steam inhibitor on the vegetable plants to form a layer of invisible cold film on the leaves, which helps to reduce the transpiration of the leaves and protect the body temperature of the vegetables. To achieve the purpose of cold.
Irrigation water insulation: The irrigation of horse water or watering of the frozen vegetables can increase the heat capacity of the soil and prevent the ground temperature from continuing to fall and reduce the freezing damage. After watering, pouring enough water, watering or watering, grasp the favorable period when temperature rises, and loosen soil to keep warm.
Trimming: After being frozen, timely cut the young shoots that have been frozen to death. Even if the seedlings of the pepper seedlings are frozen, they can germinate side branches, take one of the strong branches instead of the main stem, and cut off the remaining side branches. Fresh pruned celery after pruning in the open field can also germinate new leaves.
Grab and rush: In order to reduce the economic losses, you can plant cold-resistant spinach, Chinese cabbage, radish vegetables, and lettuce when the weather warms up. It is best to rush in the middle and small sheds, early emergence, early growth.
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