1, ditching mulching film cultivation. The cultivation of trenches and ridges in greenhouses can increase the surface area of ​​the soil, which is conducive to absorbing more heat and increasing the temperature of the ground. The cover film can increase the ground temperature by 1-3°C, and it can also increase near-ground illumination.
2, set the cold outside the warm ditch. In order to reduce the heat exchange between indoor and outdoor soils, dig out the cold-proof ditch around the greenhouse. The depth is the thickness of the local permafrost, usually about 1 meter, filled with straw, cow horse dung, or a 10 cm thick polystyrene board.
3. Add organic fertilizer in the greenhouse. The application of organic fertilizers in the greenhouse increases the temperature of the ground through the decomposition of organic fertilizers to release heat.
4, plus a small arch shed. Adding a small shed above the crop in the greenhouse can effectively increase the temperature and the ground temperature.
5, underground heating. The use of geothermal lines, underground hot water pipes and other equipment for soil heating is the most effective measure to increase ground temperature, but the cost is high.
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