Early spring vegetables beware of cold spring
There are two types of cold spring injury and cold frost in late spring. Low temperature chilling mainly occurs from March to April, causing hazards such as rotten roots, dead seedlings, falling flowers and fruits, and early pumping on spring vegetables; late spring frost generally occurs in mid-late April, frosting the surface of growing vegetable plants in the field, damage. The measures to prevent the cold spring are described as follows:
1. Low temperature refining. After the seedlings are ready, the seedbed should be ventilated, and the ventilation should be gradually increased as the weather warms up, and the seedlings should be exercised at low temperature to improve the cold resistance of the seedlings.
2. Increase protection facilities. The first is to erect windbreaks. Wind barriers have a blocking effect on cold air, preventing the surface from cooling further. The second is to ditch the planting. The depth of the ditch should exceed the height of the vegetable seedlings, and then the mulch can be covered with plastic film.
3. Temporary heating. For production in protected areas, when the cold current comes, you can set up a simple coal stove or install electric lights in the shed for temporary heating to increase the temperature in the shed and prevent frost damage.
4. Water the well. When the strong cold air passes, the weather is fine, there is no wind or breeze at night, and the temperature drops rapidly, especially when the local surface temperature drops below 0 ° C, frost can be poured on the ground, which can greatly increase the ground temperature. This method can raise the ground temperature from 0 ° C to about 8 ° C to avoid frost.
5. Smoke. On frosty nights, fumigation in the fields can effectively reduce or avoid frost disasters. But pay attention to two points: first, the fireworks should be properly dense, so that the smoke screen can basically cover the entire garden; second, the ignition time should be appropriate, it should be in the upper wind direction, lit from midnight to 2 am, until before sunrise, there is a smoke screen This works best on the ground.
6. Appropriate amount of water spray. Before the frost occurs, spray the plants with water to slow down their body temperature, and also increase the water vapor content in the atmosphere. The water vapor condenses and exotherms to alleviate the frost damage.
7. Timely cultivating. Because the temperature gradually rises in spring, the loess soil can absorb and store the solar thermal energy better. Once the frost damage comes, the frost can be alleviated because a part of the heat has accumulated in the soil.
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