The high humidity in the shed is conducive to the occurrence and spread of various diseases in vegetables, reminding the vegetable farmers to pay attention.
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. Ventilation, ventilation, dehumidification, and dehumidification should generally be carried out before and after noon, with the main wind and waistline being dominant, and the footwell can not be placed in order to prevent the greenhouse temperature 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, 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 chilling.
3, plastic film covering with plastic film can reduce the evaporation of soil moisture, and can reduce the number of irrigation, is an important measure to reduce indoor air humidity. For example, in the shed, large and small ridges are used, and the mulch covers are double ridges. When water is poured, the water flows into the small ridges below the mulch.
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 on a sunny day 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 good moisture absorption material moisture permeability and moisture absorption of good insulation materials, such as non-woven fabrics can prevent condensation on the inner surface, and prevent dew from falling on the plant, thereby reducing air humidity and crop wetting.
6. The relative humidity in the air drops by 3-5% for each increase of 1°C in the room temperature and humidity 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 3-4 hours, the temperature of the shelf can be repeated less than 25°C.
7. Dust method and smog method. 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.
8. The use of cultivating dampness When the temperature of the greenhouse is high, the surface of the shed is shallow, and the water evaporation of the surface soil is accelerated. At the same time, it cuts off the pores of the soil and prevents the deep water from moving up.
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