Anti-freezing measures for greenhouse vegetables

1. Strengthen coverage. Buckle the small arch shed in the greenhouse, make the arch frame with thin bamboo pole, cover the film at night, cover the grass grass on the film, and cover the plastic film in the shed, which can increase the temperature and keep the humidity. Plastic film is used as apron at the bottom of the shed, which can significantly reduce the invasion of cold air at the bottom. At the same time, pay attention to plug the gap in the shed to minimize the gap heat dissipation. In the north of the greenhouse, crop straw is piled up to form a wind barrier to keep out the wind and cold.

two。 Temporary heating. When the daytime temperature in the greenhouse is lower than 15 ℃ and the night temperature is lower than 5 ℃, cold injury or freezing injury may occur. Temporary heating measures should be taken at night to replenish the heat artificially, such as placing several briquettes in the shed, which can increase the temperature in the shed. However, attention should be paid to prevent carbon dioxide poisoning, adding briquettes and taking out the coal stove should be ventilated before entering people.

3. Strengthen the management of fertilizer and water. Before and during the cold spell, the application of nitrogen fertilizer to vegetables should be stopped to prevent plants from being too soft, cold resistance decreased and seedlings killed by fertilizer. 0.3%-0.5% potassium dihydrogen phosphate and 400% 500 times plant antifreeze solution can be sprayed, and dilute dung water should be poured in the shed to prevent soil from freezing so as to protect seedlings against cold.

Feng Guanglai, vegetable Station of Chengde County Agriculture and Animal Husbandry Bureau