In winter, in the vegetable cultivation and management of greenhouses, the higher humidity makes it easier for the plants to grow in length, or induces roots, causing death of plants, and creates conditions for the occurrence and spread of various diseases of vegetables. How to control greenhouse moisture in the winter, Zhang Heyi, professor of the Academy of Agricultural Sciences of Northwest Agriculture and Forestry University, reminded farmers to start from the following points.
Covering the drip-free membrane The drip-free membrane can overcome the drawbacks of a large number of water droplets attached to the inside of the membrane, significantly reduce the humidity, and the light transmission performance is good. The light transmittance is 10%-15% higher than that of the general agricultural film, which is favorable for increasing the temperature and humidity.
Reasonable ventilation Ventilation is the main measure of dehumidification. Generally, it is performed when the temperature is high around noon, and the top wind and waist wind are mainly used. The foot foot wind cannot be placed in order to prevent the temperature of the greenhouse from being too low and “sweeping the wind†to hurt the seedlings. In the winter and early spring, it is not advisable to let the morning winds discharge moisture, but the cooling caused by ventilation should be based on the premise that the crops do not suffer from cold damage.
Covering the film in the shed, the use of large and small ridge spacing between the film and cover double ridge method, water when the water flows along the small ridge below the film. The mulch prevents the evaporation of moisture, which also prevents the air humidity of the watering shed from increasing significantly.
Reasonable watering and watering are the main factors causing the humidity in the shed to increase. Generally, it should be poured with small water or gutters, and avoid flooding or flooding. When the temperature in the shed is low, especially if ventilation is not allowed, watering should be controlled as much as possible. Watering should be in the sunny hours from 10 to 12 o'clock in the morning, and it should be ventilated and ventilated. It should not be watered in the afternoon, cloudy and rainy days.
For every 1°C increase in air temperature in a warming and humidifying shed, the relative humidity in the air drops by 3%-5%. When the plant grows to have strong resistance, the watering canopy can be heated up to about 30°C for 1 hour, and then ventilated and vented. After 3-4 hours, the temperature of the shelf can be repeated less than 25°C.
The humidity of the air in the dust dehumidification shed is inherently large, and the use of conventional spraying methods increases the humidity, which is detrimental to the control of diseases. The use of dust and smog method can avoid increasing the air humidity due to spraying and improve the control effect.
The cultivator removes moisture and evaporates on the surface when the temperature of the greenhouse is high, speeding up evaporation of the topsoil, and cutting off the pores of the soil to prevent deep water from moving upwards.
Natural moisture absorption in the shed can use straw, wheat straw, quicklime and other materials in the row to adsorb water vapor or fog to achieve the purpose of dehumidification.
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