1、Cover with plastic mulch or small arch棚, vacuum pump. For high ridge cultivation within the solar greenhouse, a layer of plastic film can be covered on the high ridges, which generally can increase the soil temperature by 2~3℃. For flat bed cultivation or low seedling vegetables, a small arch棚can be erected to improve the soil temperature.
2、Set up cold-proof ditches. Dig trenches outside the south side of the solar greenhouse and fill them with thermal insulation materials such as hay, horse manure, and straw to prevent heat loss from the ground, which can increase the soil temperature in the southern part of the solar greenhouse.
3、Double-layered film coverage. Another layer of film is placed above the iron wire that holds the drip-free film. Since there is air in between, it can significantly increase the temperature inside the greenhouse.
4、Timely uncover and cover the straw mat. When temperature conditions permit, try to uncover early and cover late to fully utilize light for photosynthesis. In the depth of winter, on sunny days, the straw mat is usually uncovered when the morning sunlight covers the entire greenhouse surface. When covering the mat, the indoor temperature of the greenhouse should generally not be lower than 18℃; on cloudy or overcast days, even with weaker light, the straw mat should also be uncovered appropriately to allow diffused light to enter. On one hand, this can make the air temperature rise, and on the other hand, since there is more blue-violet light in the diffused light that promotes photosynthesis, it can make vegetables undergo photosynthesis, grow strong, and enhance their frost resistance.
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