Clean ditches to prevent water accumulation. Trenches should be dug around the greenhouse, so as to eliminate the accumulated water outside the ditches and canals in time after the rain and snow in winter, reduce the groundwater level in the field, and prevent the rain and snow from flowing back into the greenhouse and affecting the growth of vegetables in the greenhouse.
Cover, keep warm and prevent freezing. Check the plastic film covered on the scaffolding, and repair or replace it in time if it is damaged. Pay attention to the weather forecast of the local meteorological station. When the weather is fine, pay attention to ventilation and adjust the temperature and humidity in the shed. When cold air comes, don't open the shed door too early, and increase the cover. Multi-layer coverage should be adopted. A plastic shed or shed should be built in the shed, and grass curtains, non-woven fabrics and sunshade nets should be laid. It should be covered to improve the temperature in the shed. Placing grass curtains around the shed at night when conditions permit can increase the temperature in the shed by 1 ~ 3℃, effectively promote the growth of vegetables and enhance the frost resistance.
Strengthen lighting management. Long-term rainy weather in winter can easily lead to insufficient light and weak growth of plants. During the day, weeding curtains, non-woven fabrics, sunshade nets and other coverings should be uncovered in time to increase the scattered light irradiation in the shed. At the same time, pay close attention to the rain gap, ventilate for a while around noon, and timely discharge harmful gases such as ammonia outside the shed. Reuse the old film to clean, to facilitate the lighting of crops.
Drive snow in time to reduce freezing injury. Before the arrival of heavy snow, it is necessary to strengthen the support of greenhouses, tie up plastic films, and prepare for disasters such as strong winds and heavy snow. When heavy snow comes, it is necessary to sweep and shovel snow in time to prevent the greenhouse from collapsing, and the snow on both sides of the vegetable greenhouse should also be removed in time to prevent the greenhouse from absorbing a lot of heat and lowering the temperature when it melts.
Do a good job in disease prevention. Winter is often accompanied by continuous rain, snow and low temperature weather, and the humidity in the shed is high, and the plant resistance is weak, which is easy to cause disease aggravation. Special attention should be paid to the occurrence and spread of eggplant blight and gray mold in overwintering vegetables in greenhouse. Prevention and control of diseases, first, timely removal of diseased plants, branches, leaves, flowers and fruits in the shed; Second, strictly control the water used in greenhouses, reduce the air humidity in greenhouses, reduce the causes of vegetable diseases in greenhouses, and fumigate with chlorothalonil smoke agent or Sukeling smoke agent in rainy days (snowy days); The third is to seize the fine weather and actively choose to control pesticides; Fourth, combined with disease control, timely topdressing outside the roots, spraying potassium dihydrogen phosphate, and loving more harvest. , improve plant resistance.
Manage after the weather clears up. It suddenly clears up after continuous rainy days, and the plastic film cannot be uncovered immediately, otherwise the strong light will cause the vegetables to wither. Covers such as straw curtains, non-woven fabrics or sunscreen should be gradually uncovered and removed after a period of adaptation.