Cold spring has various degrees of chilling injury to spring vegetable seedlings, fruit and vegetable production in protected areas, and early-ripening vegetable production in open fields, resulting in various losses such as rot, dead seedlings, falling and fruiting, and early convulsions. Therefore, we must be vigilant for the cold and early prevention work. Strengthen the cold-time exercise at seedling stage to improve the cold resistance of seedlings. After the seedlings emerge, the seedbed should be ventilated, and gradually increase ventilation with warmer weather. The seedlings should be subjected to low-temperature exercise to improve the cold resistance of the seedlings and adapt to the outdoor low-temperature environment. There are two ways to increase protection facilities: First, build wind barriers. Wind barriers should maintain a relatively close distance, usually about twice the wind barrier height is appropriate. The second is planting trenches and covering the mulch. When planting vegetables in early spring, ditch planting can be adopted. The ditch depth requires more than the height of the vegetable seedlings, and then cover the mulch on the ditch. When temporarily warming the cold current, temporary warming can be carried out in the nursery shed or production shed with the help of a simple coal stove to increase the temperature inside the shed and prevent freezing damage. However, open fires should not be used to prevent fires. Irrigation When the temperature drops rapidly, especially when the local surface temperature falls below 0°C, a large amount of well water can be poured on the ground to greatly increase the ground temperature. This method can increase the ground temperature from 0 °C to 8 °C, to avoid frost. Smoke on a frosty night and smoke in the field can effectively reduce or avoid frost disasters. However, it should be noted that the smoke point should be properly intensive so that the smoke screen can basically cover the whole park; the lighting time should be appropriate and should be ignited in the windward direction, from midnight to 2:00 in the morning, until there is still a smoke screen shrouded in the ground before sunrise. the best. Spraying water Before the frost occurs, spraying the water on the surface of the plant with a sprayer can cause the body temperature to drop slowly, and it can also increase the content of water vapor in the atmosphere. The water vapor condenses and releases heat to mitigate frost damage. Cultivating cultivators before frost can reduce frost damage. Because the temperature in the spring rises gradually, after the clay is loosened, it can absorb and store the solar heat energy. Once the frost comes, the frost can be relieved because some heat has accumulated in the soil.
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