The cold damage of cold-proof vegetables is mainly caused by wind damage, frost damage, dryness and low temperature. Before the winter comes, wheat straw, straw, corn stalks, etc. are used to cover the seedlings, which can reduce the cold wind damage near the ground, and can also cause the cold frost to condense, release heat, and reduce frost damage. But the amount of grass can not be too much, just cover a thin layer, must not cover all the seedlings, thereby affecting the light. The average amount of grass covered per mu is 100-200 kg. After the soil is thawed in spring, the grass should be peeled off in time to avoid affecting the growth of vegetables.
Under the same conditions, irrigation in dry soil was heavier than that in moist soil. Therefore, before cold currents are flooded, water should be poured on sunny days to help the soil absorb moisture, store heat, and mitigate freezing damage. After the cold weather, the weather warms up and irrigation is performed when the soil and vegetable roots have been thawed, and the water needed for vegetable growth can be supplied in time. The amount of winter irrigation should not be too large.
Wind barriers are installed on the north side of the vegetable crop to make a wind barrier of 1.2 to 1.5 meters high with crop stalks or films, and every 2 to 3 feet can also be used to prevent cold and keep warm.
The roots of the roots and roots of mulching roots and roots of fertilizers and soils are large and tender, and are most susceptible to freezing injury, causing the whole plant to be frozen and die. When the weather is fine in mid-December, about 1500 kilograms of livestock and poultry manure is applied per acre. Mixing the soil in the ridge between the ridge and the roots of the vegetable seedlings produces a clear antifreeze effect.
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