Why can't the humidity drop in the greenhouse?

Recently, I saw in the shed of Xiaomeng, a vegetable farmer in Mengjia Village, Jitai Town, Shouguang City, Shandong Province, that the humidity in his greenhouse was very high and there were still dewdrops on the leaves of the eggplant near noon. It is understood that Xiaomeng found that when the humidity in the greenhouse was too high, he only knew how to release the air. As a result, the humidity in the greenhouse did not decrease, but the temperature of the greenhouse was reduced due to excessive ventilation, especially if the ground temperature did not rise. long. The author analyzes the reasons. First of all, do not know how to increase temperature and humidity. Heating and dehumidifying after watering is the most effective method of dehumidification. When the temperature of the greenhouse is low, the water evaporates slowly and it is difficult to reduce the humidity in the greenhouse. The correct method is: Immediately after watering, close the shed to raise the temperature to above 30°C. Then open the vent for 20 to 30 minutes for ventilation. Then close the vent to increase the temperature. Repeated ventilation and dehumidification will be effective. Second, no submerged irrigation is used. Xiaomeng watered the mulch and allowed the water to seep through the holes in the planting hole. Watering in this way, the water on the mulching film takes a long time, and it is prone to water accumulation. The moisture evaporates continuously into the shed. In this case, the air purifying and evacuation measures will not take place any more. Afterwards, the film should be arched and watered, and under-membrane under-irrigation should be adopted, so that the humidity in the canopy is naturally small, and it is also easy to dehumidify. Again, use spray to prevent disease. Due to the high humidity in the shed, Xiaomeng feared to cause the disease, sprayed the medicine after watering, which undoubtedly increased the humidity in the shed. During this period, powders or smoke agents should be used to prevent disease and try to avoid increasing the humidity in the booth.

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