In the winter and spring season, vegetables in plastic greenhouses are prone to frost damage. The simple antifreeze methods are as follows:
The multi-layer covering is made of plastic film in the greenhouse to form a two-layer screen. Covering at night, the temperature and temperature of the shed can be increased by an average of 1°C-2°C. A layer of grasshoppers with a height of 1 meter can be covered around the greenhouse. Increase the greenhouse temperature by 1°C-2°C.
Increasing the temperature of the fire to use firewood or straw for fire can also increase the temperature of the greenhouse. However, it is necessary to observe changes in the temperature of the greenhouse at any time, so that timely and appropriate, to prevent excessive smoking smoked seedlings.
Strengthen Management Before the advent of cold air, the full use of solar radiation to increase temperature, combined with timely management and management of closed sheds, can play a role in storing heat and slowing the change in night temperature. It should be noted that the thermophilic vegetables should be selected as far as possible after the cold air has been planted on sunny days. The next time the cold air arrives, the seedlings will have slowed down, which will help enhance the cold resistance of the seedlings and thus prevent frost damage.
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