Shed crops have high requirements for their living micro-climate environment, especially temperature, to do a good job of anti-freezing and warm-keeping in greenhouses, seek advantages and avoid disadvantages, and strive to reduce the negative impact of winter rain and snow cooling on greenhouse vegetable production. It is recommended to focus on the following points:
Clean the ditch to prevent waterlogging. Grooves should be dug around the greenhouses so that the water in the trenches and fields outside the fields can be eliminated in time after rain and snow in winter, and the ground water level in the fields can be reduced to prevent the rain and snow from pouring into the greenhouses and affect the growth of vegetables in the greenhouse.
Cover, keep warm and prevent freezing. Check the plastic film covered on the scaffolding of the greenhouse and repair or replace it in time if it is damaged. Pay attention to the weather forecast of the local weather station. When the weather is fine, pay attention to ventilation and adjust the temperature and humidity in the shed. In case of cold air, the shed door should not be opened prematurely. To increase the coverage, use multiple layers to cover the shed. Build plastic middle sheds or sheds, cover grass curtains, non-woven fabrics, shade nets, etc. to increase the temperature of greenhouses, and conditionally add grass curtains around the greenhouse at night to increase the temperature within the greenhouse by 1 to 3°C. Promotes robust growth of vegetables and enhances frost resistance.
Improve lighting management. In winter, when it encounters long-term rainy weather, it will easily lead to lack of light, and the growing trend will be weakened. During the day, weeds, non-woven fabrics, and shade nets shall be promptly removed to increase the scattering of light in the shed, and at the same time, we shall grasp the rainfall gap at noon. Before and after the small ventilation for a while, timely discharge of harmful gases such as ammonia out of the shed. The secondary use of old film should be cleaned to facilitate crop lighting.
Timely snow, reduce frost damage. Before the advent of heavy snowfall, it is necessary to reinforce the scaffolding of the greenhouses and tighten the plastic film to prepare for the prevention of major winds, heavy snow, and other disasters. When the heavy snow comes, it is necessary to promptly sweep snow and shovel snow to prevent the collapse of the greenhouse. The snow on both sides of the vegetable greenhouse should also be removed in time to prevent absorption of large amounts of heat and reduce the temperature inside the greenhouse.
Do a good job of disease prevention and control. Winter is often accompanied by continuous rain, snow, and cold weather. The humidity in the shed is relatively high, and the plants are weak in resistance, which can easily lead to aggravation of the disease. In wintering vegetables, we must pay attention to the occurrence and spread of eggplant diseases and gray mold. One of the prevention and treatment of diseases is the timely removal of diseased plants, diseased branches, diseased leaves, diseased flowers, and diseased fruits in the shed; second, strict control over water use in the greenhouse to reduce the humidity in the shed and reduce the incidence of vegetables in the shed, and rain (snow) days The chlorothalonil smoke agent or the quick-cylinder smoke agent is used for fumigation; the third is to catch the fine weather, and actively select and control the use of the counterpart pesticide; the fourth is to combine the disease prevention and control, to perform the top-dressing outside the house in time, spray potassium dihydrogen phosphate, etc. , increase plant resistance.
After the day is cleared, it is managed. If it suddenly shines after continuous rainy days, the covering cannot be opened immediately. Otherwise, strong light will cause the vegetables to wilt. Grazing, non-woven fabrics, or shaded nets should be gradually uncovered, and should be removed after a period of adaptation.
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