Recently, Cheng Zhihui, a professor of the Department of Vegetable Science at the College of Horticulture, Northwest A&F University, gave a training course for more than 100 students in the Vegetable Production Technology Training Course in Shaanxi Province, entitled “Practical Techniques for Facility Vegetable Cultivationâ€, one of which talked about the facility greenhouse. The effect of air humidity on vegetable growth. He said that when the winter and spring seasons are bright, the humidity in the closed greenhouse is saturated. When the humidity is saturated, it will easily condense into water droplets when it meets the surface of the plant. This kind of water droplet is the best condition for the infection of many pathogens. After the infection enters, the plant will develop disease and cause disease.
Humidity has a significant impact on transpiration, photosynthesis, disease occurrence and physiological disorders of greenhouse crops, as shown in:
1. Air humidity affects transpiration. In addition to the kinetics of plant water absorption, transpiration is also the driving force for mineral nutrient transport. The air humidity is high, the transpiration is weak, and the ability of plants to transport mineral nutrients is reduced. The transpiration can also adjust the temperature of the blade. If the temperature is high, the air humidity is high, the transpiration is weak, and the blade may be burned.
2, the size of the air humidity will affect the opening and closing of plant stomata, air humidity is too large or too small will cause the stomata to close, carbon dioxide can not enter the mesophyll cells, photosynthesis will slow down or even stop.
3, excessive air humidity is conducive to the propagation of pathogens, most fungal spore germination, hyphae development requires high humidity; too low is conducive to the occurrence of insect pests, such as red spiders and other mites occur generally in high temperature and low humidity Environment.
4. High humidity will cause the leaf surface moisture to condense, causing the leaf cells to rupture and making the plant weak.
When the greenhouse is humid, only ventilation can drain and dehumidify. Of course, ventilation is also conditional and not too casual. The following methods for reducing the humidity of the air in the shed can be used by the farmers:
1. Strengthen ventilation: internal circulation ventilation, natural ventilation, and forced ventilation. 2. Heating: The proper range of heating can reduce the relative humidity. 3. Increase the light. 4. Change the irrigation method and reduce the amount of irrigation water relatively. 5. Reduce the bare soil area on the ground. 6. Reduce the number of sprays and the amount of water. 7. Use a dehumidifier. 8. Add water retention agent.
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Introduction:
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