How to deal with vegetables in greenhouse when all kinds of bad weather comes in winter

Emergency measures for vegetables in greenhouse

First, snowy days: after the snow stops, roll up the grass curtain in time and sweep the snow on the shed immediately. The slope in the greenhouse is difficult to clean, scrape it down gently with a smooth stick and try not to scratch the greenhouse film. When it snows at night, the snow on the grass curtain should be removed in time, and the grass curtain should be wrapped with plastic film in advance to prevent the grass curtain from absorbing water, resulting in the overburden of the shed and the distortion of the arch frame, or even collapse.

Second, continuous cloudy days: should be treated separately. If there is a continuous cloudy day, as long as the temperature is not too low, open the grass curtain. If there is a short-term sun, the temperature of the shed will rise. Hang a reflective curtain on the back wall of the shed, which can also increase the light and raise the temperature on cloudy days. When there are many cloudy days in winter, plastic film should be covered earlier, which can increase the ground temperature and reduce the freezing damage of low temperature. In winter, the temperature in the shed should be above 12 ℃. When the temperature is too low, measures such as electric heating and coal furnace heating can be used.

Third, windy day: when the greenhouse film is bulging, immediately tie up the film line or put down part of the grass curtain in the middle of the roof in front of the greenhouse, preferably in the front foot of the greenhouse to cover the grass curtain, and then press it firmly with stones.

Fourth, long overcast and sunny days: cloudy and foggy weather for a long time, once the sunny day, vegetable transpiration is strengthened, root absorption can not keep up, a large number of dead seedlings, after clearing up, the temperature rises quickly, the seedlings will wilt sharply. Prevention measures: first, pay attention to cover the grass curtain to prevent flashing seedlings. Pay attention to the changes of seedlings from about 10:00 in the morning, and take measures such as appropriately covering the grass curtain and spraying clear water (or foliar fertilizer) into the shed; second, watering as slowly as possible after sunny days, and then watering the roots after restoring vitality, otherwise it is easy to cause retting roots and dead seedlings. If you need to water topdressing, you should pour small water, with the water application of fast-soluble fertilizer, the concentration should be small; third, after sunny days, root-promoting agents should be used to irrigate roots, and multi-element micro-fertilizer should be sprayed on leaves to make up for the lack of root absorption.

Fifth, the harm of diseases and insect pests: common tomatoes, celery, cucumbers, rape and so on, especially tomatoes are prone to blight and gray mold, due to long-term low temperature, vegetable growth weakening, resistance reduced, diseases and insect pests easy to occur. Botrytis cinerea is sprayed with 50% hydantoin, Schmett or Prozac 600 times, every 7 to 10 days. In order to prevent diseases, 1000 times plant growth regulators such as Green Arrow and Huafu should be sprayed on leaves to enhance the cold resistance and disease resistance of vegetables. In case of cloudy days, smoke agent or dust should be used as far as possible to prevent disease, so as to reduce the humidity in the shed and avoid the occurrence of diseases.