How to take remedial measures for overwintering vegetables after rain and snow

Overwintering vegetables

Continuous rain, low temperature, heavy snow and other bad weather have a great impact on vegetable production. It will make the roots of many vegetable crops bad, the roots shrink, and the leaves are small, thin, yellow and frozen, resulting in a variety of diseases, which is a major obstacle to increase the yield of vegetables in the greenhouse. If we want to maintain the stable production of vegetables in the greenhouse, we must strengthen the management after the disaster weather.

1. Clear the snow and strengthen the skeleton and film of the greenhouse. According to the situation, timely take measures such as snow sweeping, snow shoveling, heating and snow melting in the greenhouse, pillar reinforcement and other measures to remove snow from the greenhouse and prevent snow from collapsing. At the same time, we should continue to pay attention to the prevention of snow and windy weather. If the seedlings are frozen to death by severe low temperature, they should be replanted in time, and those without seedlings should be replanted or replanted in time.

2. Continue to do a good job of anti-freezing and warmth. It is necessary to continue multi-layer coverage at night, eggplant fruits and vegetables should be covered with more than three layers, pumpkins and cattail should be covered with five layers, the vents should be closely covered, and the interface of the inner shed should be sealed. If possible, it is best to cover some dry straw on the side ditch of the greenhouse, the middle ditch and the border, which can keep warm at night, rise and fall humidity during the day, and use electric hot lines to heat up if possible.

3. Strengthen the field management. After snow, it is necessary to clean up the ditches, remove stagnant water and prevent the absorption of a large amount of heat during melting so as to prevent the occurrence of frost and waterlogging damage. Vegetables in the greenhouse after the weather turns fine, timely remove the mulch in the greenhouse, timely ventilation in the leeward of the greenhouse; rainy weather should also timely uncover the mulch in the greenhouse, and ventilation around noon to eliminate the harm of harmful gases in the greenhouse. It suddenly turns sunny after continuous rainy or snowy days, pay attention to plant changes during ventilation, and find wilting, immediately covered with sunshade net, non-woven cloth, straw curtain, etc., and then uncover and wilt again after restoration, so repeatedly, after 2-3 days, it can be transferred to normal management, such as uncovering it, it is easy to cause abortive seedlings, if it is still wilted after being covered with sunshade net, non-woven fabric and straw curtain, artificial water spraying should be carried out in the shed. Vegetables in the open field can be trenched and drained in time, and straw can be spread to strengthen heat preservation in order to prevent freezing injury.

4. Strengthen the prevention and control of diseases and insect pests and apply fertilizer reasonably. In order to improve the control effect, fumigant should be used to control the diseases such as Botrytis cinerea and seedling quenching disease in greenhouse after snow. Scientific and rational application of phosphorus and potassium fertilizer to improve the cold resistance of vegetables. For chilling and freezing-injured vegetables and seedlings, 300 times liquid rice vinegar is used to spray leaves, or 0.2% potassium dihydrogen phosphate can be sprayed on leaves to increase vegetable resistance. When the leaves of cucumbers and tomatoes are lighter, 75 grams of urea can be added. 1000 times plant power 2003 was used for extra-root topdressing to enhance plant cold resistance and promote crop growth as soon as possible.