Anti-freezing technology of vegetables at low temperature

After entering winter, vegetables are extremely vulnerable to freezing damage, especially freezing has a great impact on the yield of vegetables, in order to plant good vegetables, cold and antifreeze measures are essential, how to make vegetables safe, do a good job of low temperature antifreeze measures is extremely important, the following and Xiaobian together to understand it.

1. Late opening and early cover

In sunny days, greenhouse vegetables should pay attention to ventilation and seedling training, open early cover at night, ventilate for a while around noon, timely discharge harmful gases such as ammonia gas out of the shed, in continuous rainy, long overcast suddenly sunny, or snow after sunny days, can not all open the cover at one time, should be opened in time, so that plants slowly adapt to the environment, which is conducive to the healthy growth of vegetables. To prevent freezing injury, it is also necessary to keep the shed film clean, increase the transparency of the film, increase the light, and increase the temperature of the shed.

2. Fertilization and soil cultivation

The professional technology of freezing vegetables during intertillage and fertilization can generally be applied to the roots of vegetables with decomposed farm manure, which can loosen the soil, improve the ground temperature and protect the roots of vegetables. Especially for low-lying plots, ditch systems should be dug around to ensure that the ditches are unobstructed, so that accumulated water can be removed in time after rain and snow in winter, and snow on the greenhouses can be removed in time after rain and snow, so as not to collapse the greenhouses with snow.

3. Control nitrogen fertilizer

Vegetable seedlings can not be applied too much nitrogen fertilizer, this is because the cold resistance of seedlings is poor, so before the arrival of low temperature freeze injury, 0.2% potassium dihydrogen phosphate solution can be sprayed on leaves 2-3 times. Plant ash can also be scattered once on the production surface, which can not only prevent cold and freeze, but also increase nutrients, but also have an excellent effect on preventing root rot in production. In addition, winter irrigation must be fully irrigated, so that field vegetables can survive safely.

4. Strengthen coverage

Before the cold damage comes, it is necessary to cover straw or plastic film, cloth, etc. on the open field vegetables. The greenhouse vegetables should be reinforced in advance, and the greenhouse film should be compacted. The method of multi-layer covering should be adopted. The small and medium-sized arch shed should be buckled in the greenhouse, and the film, grass curtain or non-woven fabric should be covered. This can improve the growth temperature of vegetables and reduce heat dissipation.

The above is the introduction of vegetable low temperature antifreeze technology, I hope to help you, want to know more about the relevant knowledge, please pay attention to us.