First, the cultivator can carry out shallow cultivator can break the ground, combined cracks, can control the transpiration of groundwater to take away the heat, but also protect the insulation and cold seedlings. Second, foliar spray nutrient vinegar mixed with sugar and superphosphate, dubbed 100-300 times liquid, sprayed on the leaf surface, can increase the degree of sugar and hardness of mesophyll, and improve cold resistance. 3. Timely cover a greenhouse with a wall thickness of 1m in general, absorb heat during the day, store 50% to 60% of the indoor total energy at night, absorb 20% to 30% of the heat absorbed by the soil, and occupy space heat. 20% - 30%. Covering can significantly reduce indoor heat loss. Fourth, the back wall hanging reflective film hanging on the back wall of a plastic film reflective, can increase the light intensity of the cultivation bed, the wall at night to store heat energy released slowly in the room, can maintain a higher temperature after the middle of the night to prevent freezing and chilling. Fifth, the lights fill the light to increase the temperature of the installation of lights, cloudy morning and evening turn on the light to the vegetables to fill the light 3-4 hours, not only warming, but also increase production by 10% -40%, shorten the growth period of 17-21 days. Sixth, chooses the purple film In the winter solar spectrum ultraviolet ray only accounts for about 5% of the summer, the white film cannot pass through the ultraviolet ray, but the purple film passes the ultraviolet ray. The use of purple film at room temperature is 2°C-3°C higher than that of green film. China Agricultural Network Editor
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