It refers to the phenomenon that the minimum temperature in the sheds under abnormal conditions is lower than the minimum outside temperature. There are two main reasons for this:
First, in case of sunny days, during the daytime, the temperature of greenhouses rapidly increases, and the radiating heat is released through long-wave radiation through the cover at night. When the temperature of a greenhouse is below 0°C, the temperature inside the greenhouse will fall below 0°C. -1°C or -2°C);
The second is that the temperature of the leaf surface of the seedlings is higher than the temperature and radiant heat is also generated.
Increase insulation capacity
For warming and heat preservation, the safest and most effective method is to use “sheaths inside greenhousesâ€. Bamboo sheds and reinforced membranes can be used in small sheds. The temperature in the sheds is generally 2.5°C to 3°C higher than that of a greenhouse. The shed is best to use the inner membrane of the next year, and the new membrane generally has serious drips.
Prevent temperature from falling
In the cold weather, covering the grass with a layer of film can not only block the wind, but also prevent rain and snow from wetting the straw curtain, which can reduce heat loss caused by evaporation of water. At night, straw curtains made of dry straw or other straws are added around the facility sheds, which can increase the temperature of the shed by 1°C to 2°C.
Avoid cold wind intrusion
Since the gates of facility sheds often start to affect the effect of heat preservation, curtains or old membranes are used to make curtains outside the gates to prevent the intrusion of cold air.
Improve anti-"inversion" function
Collaboration outside the shed to excavate the cold-proof ditch to prevent groundwater from infiltrating into the shed, resulting in lower temperature within the shed; seedlings should be placed as far as possible in the middle of the facility shed, and some debris can be piled up on both sides of the facility shed to increase the temperature; conditions are available at the facility. In the greenhouse, electric heating lines, furnace fires, and electric lights are added.
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