Management of humidity in greenhouses

Management of humidity in greenhouses

The plastic film is airtight, and the cultivation of the shed is due to the evaporation of soil moisture and the transpiration of the crop, so that the humidity in the shed increases. If not ventilated, the relative humidity of the air in the shed can reach 90% or even 100%. The change rule is that the shed temperature rises and the relative humidity decreases; the shed temperature decreases, the relative humidity rises; the sunny day, the windy day has low relative humidity, and the cloudy and rainy days increase relative humidity. The absolute humidity in the shed rises rapidly with the increase of the temperature of the shed, and even increases exponentially. If the relative humidity in the shed is too high, the transpiration of the leaves of the plant will be inhibited, the soil moisture and the humidity of the air in the shed will increase, and a large amount of water condensed on the shed film will affect the photosynthesis of the crop, which is not conducive to the growth and development of the plant. It also causes the bacteria to multiply, the disease is prevalent, and the damage is serious. Therefore, adjusting the temperature and humidity inside the shed, especially the temperature and humidity at night, is an important measure to prevent diseases and promote the growth and development of crops, and should be given attention and strengthened.