Under cold and snowy conditions, crops covered with high ridges and mulch are more resistant to freezing. The advantages of the two cultivation methods are analyzed below:
High ridge cultivation: Soil surface area is an important factor affecting soil temperature. The use of high ridge cultivation can significantly increase the surface area of ​​the soil. The soil absorbs more heat and increases the temperature. Not only is the soil temperature high, but also the hot soil layer is thick, and the accumulated heat is much. Higher soil temperature is beneficial to increase the vitality of the root system, thereby enhancing the resistance to cold, thereby reducing the occurrence of chilling and freezing damage.
Covering the mulch: After the soil covers the mulch, it will inhibit the evaporation of water, thus reducing the heat consumption in the greenhouse, and improving and stabilizing the temperature inside the shed. According to statistics, a 350 cubic meter greenhouse will evaporate 10-15 kilograms of water from the soil at least every day, losing 24,325 to 36,488 kilojoules of heat, which can increase or decrease the temperature in the greenhouse by 7-10 °C. Therefore, film mulching is an effective measure to maintain heat balance, stabilize the temperature inside the shed, and prevent freezing damage. When covering the mulch film, it is necessary to cover the entire area between the rows and the plants, and the operation aisle and the front of the greenhouse should also cover the whole area.
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