Overcast weather is often accompanied by low temperature, high humidity, and low sunshine. It is extremely detrimental to the growth of greenhouse vegetables, and it is easy to induce various pests and diseases. We must strengthen management. Insulation anti-freeze fog days should be appropriately increased cover to prevent vegetables frozen. In case of continuous fog and fog, the cover must be properly exposed and watched for changes in temperature after it is uncovered. If there is a slight drop, it should follow the lid; if there is a slight increase, the cover can be re-covered before 2 pm . If the temperature in the shed continues to drop, artificial heating is required. Continual overcast and foggy days after a sunny day, after removing the cover, pay attention to observing the changes in the seedlings, find wilting, immediately cover, recover and then open, wilt and then covered, so repeated, after 2-3 days, you can transfer Normal management; if you leave it open, it is easy to cause "falling seedlings." Increase the light to keep the film clean and increase the amount of light. Strengthen the management of greenhouse sheds, and make full use of cloudy scattered light to make photosynthesis of plants through timely disclosure and timely cover. If necessary, three 40-watt fluorescent lamps can be used together to hang 45 cm from the seedlings, or use a 100-watt high-pressure mercury lamp to suspend artificial light at 80 cm from the seedlings. Dehumidified greenhouse vegetables must be strictly controlled from beginning to end, especially in foggy days, generally do not water, to prevent injury. If the humidity in the booth is too large, promptly ventilate and drain it; if it cannot be ventilated, weeds can be used to soak moisture in the rows or in fine dry soil. Scientifically Preventing Diseases and Insect Pests Preventing greenhouse diseases and pests in greenhouses should pay attention to the selection of symptomatic and high-efficiency pesticides, and use the smog method or dust method as far as possible. If spraying methods are used, the number of prevention and control should be minimized to reduce the humidity in the greenhouse.
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