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. Therefore, it is very important to scientifically control the air humidity in the shed. Here are 10 effective measures to reduce the air humidity in the shed:
1. Covering the drip-free membrane with a dripless membrane can overcome the disadvantages of a large number of water droplets attached to the inside of the membrane, significantly reduce the humidity, and has good light transmission performance, and the light transmission rate is 10%~15% higher than that of the general agricultural film, which is favorable for increasing temperature and reducing humidity. .
2. Ventilation ventilation Dehumidification ventilation is the main measure of dehumidification, generally should be carried out before and after noon when the temperature is high, mainly to put the top wind and waist, can not put the foot foot wind, in case the temperature of the greenhouse is too low and "sweep wind "Injury. 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.
3. The use of plastic film covering with plastic film 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.
4. Reasonable watering and watering are the main factors that cause 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 sunny from 10 to 12 o'clock in the morning, and cooperate 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.
5. The use of a good hygroscopic insulation material The material of the insulation curtain with good moisture permeability and hygroscopicity, such as non-woven fabric, can prevent condensation on the inner surface and prevent dew from falling on the plants, thereby reducing air humidity and wetness of the crop.
6. The relative humidity in the air drops by 3% to 5% for every 1°C increase in the air temperature in the greenhouse. 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 3~4 hours, the temperature of the shed can be less than 25°C.
7. Dust method and smog method The air humidity in the medicine shed is inherently large, and it is necessary to increase the humidity using the conventional spray method. This is unfavorable for 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.
8. The use of cultivating dampness When the temperature of the greenhouse is high, the surface of the surface is shallow and the evaporation of surface soil water is accelerated. At the same time, it cuts off the pores of the soil and prevents the deep water from moving up.
9. Hanging reflective screens Hanging reflective screens can not only increase the light intensity, but also increase the ground temperature and temperature around 2°C. Because the relative humidity decreases as the temperature rises, the hanging light curtain also has a certain degree of dehumidification.
10. Natural moisture absorption can use straw, wheat straw, quicklime and other materials to spread water vapor or fog between the rows to achieve the purpose of dehumidification.
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