Why is there such a weather phenomenon as "sunny frost"?

On a clear and windless night, due to strong radiation and heat dissipation, the ground appears low temperature, which is called "clear frost" or "static frost" by the masses and "radiation frost" in meteorology.

First, affected by the invasion of strong cold air in the north, the temperature dropped sharply. After the wind stopped, the night was fine, the radiation was strong, and the temperature dropped again, causing frost. This kind of cream is called mixed cream or advection radiation cream, and it is also the most common cream.

Once this kind of frost happens, the temperature often drops sharply, and the air is dry and cold, which is easy to wither and die crops and garden plants. Therefore, special attention should be paid to this frost to avoid serious economic losses.

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Post-disaster remedy

We should actively strengthen on-site management. On vegetables, frozen seedlings should be removed on sunny days, and attention should be paid to the occurrence and prevention of gray mold and early blight of eggplant vegetables. It can spray 50% chlorpheniramine 1000 times, 15% lujiabao 1000 times and 28% botrytis cinerea 500- 1000 times.

At the same time, combined with the prevention and treatment of viral diseases and aphids, viral diseases can be treated with poison-inhibiting star and bacterial poison-killing star. Aphids can be treated with imidacloprid drugs. For the seedlings that are not damaged by freezing, it is also necessary to seize the sunny day and generally apply the medicine once according to the above method.

Continuous rainy weather, unable to apply pesticide, can use 20% 100% fumigant, according to the greenhouse space consumption of 0.2-0.3 g/m3, pay attention to weak seedlings and greenhouses can not be used.