The effect of foggy days on greenhouse vegetables is short photoperiod, which is not conducive to photosynthesis. Under normal circumstances, the lack of light in the fog, the fog gradually dispersed near the noon, lighting time shortened by 3 to 4 hours. Insufficient illumination reduces the photosynthesis of vegetables in the greenhouse and decreases photosynthetic products, which cannot meet the nutrients needed for vegetable growth and affect growth. The reason is:
The light intensity is not enough, and the room temperature is too low. 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 about 15°C~20°C during the day. It can not meet the temperature required for normal vegetable growth. It is easy to cause the leaves to shrink, they can't stretch, and the new leaves are not easy to pull out. Seedlings, rigid seedlings.
Humidity in the air is high, and it is easy to cause diseases. Fog and sunlight are not enough. The temperature is low, and the greenhouse is rarely ventilated and ventilated. Even if the ventilation is due to the dense fog from the outside, the air humidity in the greenhouse cannot be reduced. Higher air humidity is a good condition for the occurrence and prevalence of various diseases. Therefore, after the dense fog, various diseases can easily occur or become popular. The following measures should be taken:
As early as the late cover, increase the temperature immediately after the fog spread, open the grass cover, try to postpone the cover time in the evening, extend the lighting time, is conducive to the increase in indoor temperature. Shorter vegetables, timely covered with a small shed, such as spinach, rape, cauliflower, cabbage, etc., can be covered with a small plastic shed above the vegetable shed, play a role in warming insulation.
Clean the shed film, increase the light with a dry mop or a clean soft cloth to gently wipe the shed film, remove the dust on the shed film, grass clippings and other dirt, increase the transparency of the shed film, increase the indoor light intensity, is conducive to the temperature The improvement and the manufacture and accumulation of organic substances.
Watering Science to Reduce Diseases Fog and Fog The water content in the air is very large, and the humidity in the greenhouse is also very large. At this time, try not to water, prevent indoor humidity from increasing, and create conditions for various diseases.
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