Early spring vegetables should prevent cold
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1. After the seedlings of low-temperature hardening seedlings emerge, the seedbeds should be ventilated, and gradually increase the ventilation volume as the weather warms up. The seedlings are subjected to low-temperature exercise to improve the cold resistance of the seedlings and adapt to the outdoor low-temperature environment.
Second, increase the number of facilities to increase protection facilities can take two ways: First, the erection of wind barriers. The wind barrier has a blocking effect on the cold air and prevents the surface from further cooling. The second is planting trenches and covering the mulch. When planting vegetables in early spring, the ditching planting method can be adopted, and the ditch depth requires more than the height of the seedlings, and then the dura can be covered with a plastic film.
III. Temporary warming When the cold current comes, temporary heating can be performed by building a simple coal stove or installing electric lights in the nursery shed or production shed to increase the temperature inside the shed and prevent freezing damage.
IV. Watering the well When the strong cold air passes, the weather is clear, there is no wind or breeze at night, and the temperature drops rapidly, especially when the local surface temperature falls below 0°C. When the frost occurs, the well water can be poured on the ground to a large extent. Increase the temperature.
V. Lighting fumes In frost nights, fuming in the fields can effectively reduce or avoid frost disasters. However, there are two things to note: First, the pyrotechnics should be dense enough to allow the smoke screen to cover the whole park; second, the lighting time should be appropriate. It should be lit in the upper wind direction, from midnight to 2:00 in the morning until sunrise. There is a smoke screen covering the ground. This works best.
6. Spraying Water Before the frost occurs, spraying the water on the surface of the plant with a sprayer can slow down the water and increase the content of water vapor in the atmosphere. The water vapor condenses and releases heat to mitigate frost damage.
7. Timely cultivator cultivators before frost can reduce frost damage. Because of the gradual increase in temperature in the spring, after the clay is loosened, the solar thermal energy can be better absorbed and stored. Once the frost comes, the frost can be alleviated because some of the heat has accumulated in the soil.