High air humidity in the greenhouse will increase the probability of plant disease. The following measures can be taken to reduce the humidity of the greenhouse. 1. Ventilation. This method can remove the moisture in the greenhouse and replace it with dry air outside. 2. Cover with drip-free film. It can overcome the disadvantage of a large number of water droplets in the film, significantly reduce the humidity, and has good light transmittance, which is conducive to increasing temperature and reducing humidity. 3. Use drip irrigation or infiltration irrigation. Drip irrigation and infiltration irrigation can effectively reduce the increase in air humidity caused by watering. 4. When the greenhouse temperature is high on a sunny day, the surface of the soil will be shallowly hoed to accelerate the evaporation of topsoil water. 5. Plastic film mulching can greatly reduce the evaporation of groundwater, and can reduce the number of irrigation, thus reducing the air humidity. 6. Use a dehumidifier for greenhouse. The dehumidifier can accurately control indoor humidity. According to the different growth humidity required by the crops and plants planted, the dehumidifier can be flexibly used to control the humidity.
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