Although it is now in its infancy, since January 31, the northern region has continuously encountered the invasion of strong cold air. The vegetable farmers should be alert to the occurrence of cold weather and do a good job in preventing cold. Cold spring cold and late spring frost are two types: Low temperature cold damage mainly occurs in early spring, causing damage to spring vegetables such as rot, dead seedlings, falling and fruit falling, and early convulsions; late spring frost usually occurs in mid-late April, causing the field to grow. Frost on the surface of vegetable plants causes damage. The measures for preventing cold spells in winter are introduced as follows: 1. After low-temperature hardening, the seedbeds should be ventilated, and the ventilation should be gradually increased as the weather becomes warmer. The seedlings are subjected to low-temperature exercise to improve the cold resistance of the seedlings and to adapt to outdoor low temperatures. surroundings. Second, increase protection facilities Add 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. Third, temporary warming protection production, in the cold current, in the nursery shed or production shed by means of building a simple coal stove or install lights for temporary heating, in order to improve the temperature inside the shed to prevent freezing damage. IV. Watering wells 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 frost occurs, a large amount of well water can be poured on the ground to a large extent. Increase the ground temperature. This method can increase the ground temperature from 0 °C to 8 °C, to avoid frost. 5. During the night of smoke and frost, smoking in the fields can effectively reduce or avoid frost disasters. But pay attention to two points: First, the fireworks should be more dense, so that the smoke screen basically covers the whole park; Second, the lighting time should be appropriate, should be in the wind direction, from midnight to 2 o'clock in the morning, until the sunrise, there is smoke enveloped On the ground, this works best. Six, the amount of water spray before the frost occurs, spray the water spray on the plant surface, can make its body temperature decreased slowly, but also can increase the atmospheric water vapor content, condensation of heat vapor, to mitigate frost damage. 7. Timely cultivator cultivators before frost can reduce frost damage. Because the spring temperature gradually rises, after the clay is loosened, more solar energy can be absorbed and stored. Once the frost comes, the frost can be alleviated because some of the heat has accumulated in the soil.
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