What to do when onion seedlings are frozen

Vegetables suddenly encountered cold wave weather, the temperature suddenly dropped more than 10 ℃, strong wind, rain and snow weather brought a devastating blow to onion seedlings in slow seedling stage after planting, resulting in varying degrees of freezing death of onion seedlings, especially some small diameter, weak onion seedlings are more serious. The following three countermeasures are described below. First, check seedlings and replenish seedlings until the temperature rises and warms up, go to the field in time to check the situation of seedlings, for the emergence of frozen dead seedlings, there is no recovery of seedlings to resolutely root out, replant strong seedlings. For the land where the dead seedlings are serious and can not be replanted, we can consider destroying stubble and arrange to plant other crops to reduce the loss. 2. if the planting period is postponed appropriately, the planting time of onion seedlings has not yet been planted, and when the temperature rises obviously and there is no big cooling weather, choose sunny weather with higher temperature. Third, increasing temperature and heat preservation for the land where onion seedlings have been planted, bamboo poles or pieces of bamboo can be used to build a small arch shed, which can be covered with plastic film, so as to increase the air temperature and ground temperature in the field, so as to promote the root system of the seedlings and slow down the seedlings. For the plots that have not yet planted seedlings, the method of laying double-layer plastic film can be adopted, and where possible, a small arch shed can be added above to increase and maintain the ground temperature, and then plant it when the temperature rises, so that the higher temperature is beneficial to slow down the seedlings very quickly.