The high humidity in the shed is not conducive to the normal growth and development of vegetable crops. The high humidity and high temperature make it easy for the plants to grow long, and high humidity and low temperature can easily induce the roots of the roots and cause the death of the plants. The high humidity in the shed has also created conditions for the occurrence and spread of various diseases in vegetables. Especially in winter and early spring, there is a lot of rain and snow, and there is a long time for sheds. It is easy to form a high-humidity environment in the shed. Decreasing the humidity in the greenhouse is the key to ensuring the robust growth of vegetables in the greenhouse and preventing the spread of diseases. Here are some effective measures to reduce the humidity in the greenhouse: 1. Cover with no drip film. Due to the difference in internal and external temperatures, condensation in the greenhouse film is unavoidable. The surface of the common plastic film has a uniform distribution of dew condensation, and therefore, the dripping surface is large and the air humidity is increased. After the dripless membrane is used, although the surface of the membrane is dew, the water droplet flows down the membrane surface, the drip surface is small, the humidity is obviously lowered, and the light transmission performance is good. The light transmittance is 10% to 15% higher than that of the general agricultural film, which is beneficial to the increase. The temperature drops wet. 2. Plastic film cover. The use of mulching can reduce the evaporation of soil moisture, and can reduce the number of irrigation, which is an important measure to reduce the indoor air humidity. For example, in the shed, large and small ridges and ridges are used to cover the ridges. When water is poured, the water flows into the small ridges below the mulch. The mulch prevents the evaporation of moisture, which also prevents the air humidity of the watering shed from increasing significantly. 3. Reasonably dense planting. Density within the greenhouse should not be too dense to facilitate ventilation and reduce air humidity. 4. Ventilation. Exhalation is the main measure of dehumidification. Generally, it should be carried out before and after noon, with the main wind and waistline being the main wind. The footwell wind must not 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 drain moisture. Ventilate early in high temperature seasons, pass strong winds, close winds in the evening, and use short-term ventilation when the outdoor temperature is high at noon even on cloudy days. If the humidity in the shed is high and the temperature is above the minimum temperature limit for crop growth, the amount of ventilation should be gradually increased, and the air humidity should be reduced as soon as possible. However, the cooling caused by ventilation should be based on the premise that the crop does not suffer from cold damage. 5. Reasonably water. Watering is the main factor that causes the humidity in the shed to increase. The number of waterings and the amount of watering each time depends on the weather, soil conditions, types of vegetables, growth period and growth potential. Generally, small water or gutters should be poured, and flooding or flooding should be avoided. If vegetable vegetables, planting water and seedling water are to be thoroughly saturated, the water supply will be sufficient during the result period, and watering will not be required in other periods. When the temperature in the shed is low, especially if ventilation is not allowed, watering should be controlled as much as possible, and irrigation can not be performed by using a broom irrigation method. Watering should be on a sunny day from 10 to 12 o'clock in the morning, and it should be combined with ventilation to remove moisture. Do not water in the afternoon, cloudy and rainy days. Avoid watery days after watering. When conditions permit, furrow irrigation or drip irrigation can be used to reduce the amount of irrigation and evaporation. 6. Strengthen the cultivator loose soil. Before covering the mulching film after planting, timely cultivating loose soil after watering can reduce evaporation, maintain soil moisture, reduce the number of watering, and reduce air humidity. 7. Heating and cooling. The relative humidity in the air decreases by 3% to 5% for every 1°C increase in air temperature inside the shed. Using warming and dehumidification can not only meet the temperature requirement of vegetables, but also reduce the relative humidity of air. When the plant grows to have resistance, the watering canopy is heated to about 30°C for 1 hour, and then ventilated and vented. After 3 to 4 hours, the temperature of the canopy is less than 25°C. 8. Dust method and smoke method medication. The air humidity in the shed is inherently large, and the use of conventional spraying methods increases the humidity, which is detrimental to disease prevention and control. The use of dust and smog method can avoid increasing the air humidity due to spraying and improve the control effect. 9. Use a good thermal insulation curtain material. A moisture-permeable and moisture-absorbing insulation curtain material, such as a non-woven fabric, can prevent condensation on the inner surface and prevent dew from falling onto the plants, thereby reducing air humidity and crop wetting.
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Reduce greenhouse humidity comprehensive measures