Prevention and Control measures of low temperature Frost injury of Chinese Cabbage

After Frosts Descent, the temperature dropped sharply, and for the early planting of autumn cabbage, it has now reached a period of continuous listing, while for the late planting of Chinese cabbage, it is necessary to do a good job in preventing low temperature and freezing injury, otherwise it is very likely to reduce production in a large area.

I. low temperature hazard

The low temperature of Chinese cabbage has two harms, one is the low temperature harm, which is also called chilling injury, which mainly occurs in the heading period of Chinese cabbage. When the temperature is lower than 10 degrees, the growth rate of Chinese cabbage will become very slow, and when it is less than 5 degrees, it will basically stop growing. In the north, the temperature drops faster than in the south, and it will usher in a cold snap ahead of time, which will cause a sharp drop in temperature, resulting in unsound cabbage, low yield and quality. Second, freezing injury, planting cabbage in the north, in the first half of the harvest, will suddenly encounter cold spell and snow weather, the temperature drops below 0 degrees, it is very easy to lead to the freezing injury of cabbage leaves, difficult to recover.

II. Prevention and control measures

1. Watering

After the attack of strong cold air, the weather is clear, there is no wind or breeze at night, and the air temperature drops rapidly, especially when the surface temperature is below 0 degrees, a large amount of well water can be irrigated to increase the ground temperature. make the surface temperature rise to about 8 degrees so as to avoid frost. Generally, North China is watered in the first and middle of November, Northeast and Northwest China in mid-late October, and the Yangtze River Basin from late November to early and mid-December.

2. Spray water

Before the occurrence of frost, you can use a sprayer to spray water on the surface of the plant, which can slow down the temperature of the plant, increase the content of water vapor in the atmosphere, and make the water vapor condense and release heat to ease the frost.

2. Spray cold-resistant agent

Can be used per mu of cold-resistant agent or anti-stress yield increasing agent 100ml, diluted with water, spraying plants, can also play a good cold resistance effect.

The above is the introduction of low temperature freezing injury prevention and control measures of Chinese cabbage. I hope it can help you. If you want to know more about it, please pay attention to us.