Fog is a common weather phenomenon in winter. When the water vapor in the lower atmosphere reaches saturation, water vapor condensates float in the air to form hazy weather. The overcast fog weather is accompanied by low temperature, high humidity, and little sunshine, which is extremely unfavorable to the growth of greenhouse vegetables and is easy to do. Inducing various pests and diseases must be effectively strengthened.
1. Insulation Antifreeze Fog days should be appropriately increased to prevent vegetables from freezing. 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. Continuous yin and foggy days after sunny days, after removing the cover, pay attention to observing the changes of the seedlings, find wilting, immediately cover, recover and then open, wilt and then cover, so repeated, after 2 to 3 days, you can transfer Normal management; if you leave it open, it is easy to cause "falling seedlings."
2. Increase lighting to keep the film clean and increase the amount of light transmitted. 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.
3. Control the humidity The greenhouse vegetables must be strictly controlled watering 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.
4. Scientific use of fog to prevent greenhouse diseases and insect pests, we should pay attention to the use of symptomatic, high-efficiency pesticides, and as far as possible the use of smog or dust method; if the spray method of spraying, to minimize the number of prevention and control to reduce the humidity within the greenhouse.
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