Nowadays, it is usually in the late autumn and early winter, and fog often appears. This has brought certain difficulties to the vegetable production in the greenhouse. In order to effectively overcome the adverse effects caused by foggy days and strive to reduce the losses to a minimum, the impact of foggy days on greenhouse vegetables and their countermeasures are briefly described below for reference by farmers.
One of the effects of foggy days on greenhouse vegetables is that the lack of sunlight in the foggy days shortens the illumination time by 3-4 hours, which reduces the photosynthesis of the vegetables in the greenhouse and reduces the photosynthetic products, which can not meet the nutrients needed for vegetable growth and affect the growth. Second, in the fog, the temperature in the greenhouse is difficult to increase. In general, the temperature in the greenhouse is about 15°C at night and 15°C-20°C during the day. The temperature needed for normal growth of vegetables cannot be met, and young and tender seedlings are easily formed. In addition, after the dense fog, various diseases easily occur or become popular.
Responses
First, clean the film and increase the light. Use a dry mop or clean soft cloth to gently wipe the shed film to remove dust, grass clippings and other dirt on the shed film, increase the transparency of the shed film, increase the indoor light intensity, and help increase the temperature and manufacture and accumulation of organic substances. Second, cover the late cover early to increase the temperature. Immediately after the fog spreads, the grasshopper will be lifted. At night, it will try to postpone the time of covering the canopy and extend the lighting time, which is conducive to the increase of indoor temperature. Short vegetables on the plants are covered with small arches. Such as spinach, etc., can be covered with a small layer of plastic shed on the top of the dish, play a role in warming and heat preservation. In addition, scientific watering is needed to reduce disease. Avoid watering in misty days to prevent indoor humidity from increasing and create conditions for various diseases. If the soil is too dry and not watered, try to pour small water or use the method of dark pouring under the membrane.
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