After the recovery of slow-onset seedlings, the topdressing quick-effect fertilizers and frozen vegetables can be topdressed with available nitrogen fertilizers, phosphorus and potash fertilizers, and promote the recovery of vegetable plants. Before the onset of low temperature, 0.2%~0.3% potassium dihydrogen phosphate solution may be sprayed 1~2 times to increase the cold resistance of the plants, or 400~500 kg of thin human and animal manure water and fertilizer may be applied per acre to reduce the icing degree of the soil. Reduce frost damage. Spreading fire ash or ash in the vegetable room can not only prevent cold and prevent freezing, but also play a role in increasing potash fertilizer, and has a good effect on root rot of cruciferous vegetables.
Spraying fresh water or steaming agent to plant vegetables and seedlings in greenhouses 2 to 3 days after slight frostbite, short-term shading before and after noon, avoid sudden loss of water due to strong light, and spray a small amount of fresh water at noon according to air humidity conditions. In order to increase the surface temperature and humidity, the dehydration and desiccation of the frozen tissue is suppressed, and the frozen tissue is promoted to absorb water. In the 3~4 days before the onset of the cold wave, sunny days sprayed 30 to 40 times petroleum inhibitors on 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. To achieve the purpose of cold.
Irrigation and Insulation Irrigation of horses or water on frozen vegetables can increase soil heat capacity, prevent ground temperature from falling, and reduce frost damage. After watering, pouring enough water, watering or watering, grasp the favorable period when temperature rises, and loosen soil to keep warm.
After pruning and pruning, freeze the young shoots that have been frozen to death. Even if the seedlings of the pepper seedlings are frozen, they can germinate collaterals if they are well cared for. Take one of the strong branches to replace the main stem and cut off the other side branches. Fresh pruned celery after pruning in the open field can also germinate new leaves.
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