Shed room control is focused on dampness
2022-10-22 08:06:06
The relative humidity required for spore germination is more than 80%, and the relative humidity required for hyphae growth is about 90%. The relative humidity in a typical greenhouse is 85% to 90%. If the temperature is low at night, on cloudy days or after watering, the relative humidity is usually saturated or nearly saturated. Under these environmental conditions, various diseases occur quickly, spread rapidly, and cause severe disease. In addition to selecting the appropriate agents for prevention and control, the following measures should be taken to reduce the humidity of the greenhouse:
Cover with no drip film
The drip-free membrane can overcome the disadvantages of a large number of water droplets attached to the inside of the membrane, significantly reducing 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 temperature and decreasing humidity.
Ventilation and dehumidification
Exhalation is the main measure of dehumidification. Generally, it should be carried out before and after noon, with the top wind and waistline prevailing. The footwell can't 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. In the hot season, early ventilation, strong wind, and late wind-breaking are required. Even on cloudy days, short-term ventilation is required when the outdoor temperature is high at noon. 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 to bring the air humidity down. However, the cooling caused by ventilation should be based on the premise that the crop does not suffer from chilling.
Reasonably watering
Watering is the main factor that causes the humidity in the shed to increase. The number of watering and the amount of water each time depends on the weather, soil conditions, the type of vegetables, growth period and growth potential, generally should be poured into small water or gutters, and avoid flooding or flooding. The colonization water and the slow seedling water of fruit and vegetable vegetables must be thoroughly irrigated, and the result should be sufficient water supply. In other periods, watering is generally not required. When the temperature in the shed is low, especially when it is not possible to vent the air, watering should be controlled as much as possible. Watering should be carried out on a sunny day from 10 to 12 o'clock in the morning, and it should be accompanied by ventilation and humidity. Water should not be poured 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.
Warming and dehumidification
For every 1°C increase in air temperature in the shed, the relative humidity in the air will drop by 3% to 5%. The method of increasing temperature and decreasing humidity can satisfy the temperature requirement of vegetables and reduce the relative humidity of air. When the plant grows to have strong resistance, the watering canopy can be heated up to 30°C for 1 hour and then ventilated and vented. After 3 to 4 hours, the temperature can be repeated once the temperature is below 25°C.
Dust method and smog method
The air humidity in the shed is inherently large, and the use of conventional spraying methods will increase the humidity, which is detrimental to the control of diseases. The use of dust and smog method can prevent air humidity from increasing due to spraying and improve the control effect.
Cultivated wet
When the temperature of the greenhouse is high, the surface is shallow and shallow, which can accelerate the evaporation of the surface soil, cut off the pores of the soil, and prevent the deep water from moving upwards, which also has a certain effect on reducing the humidity in the greenhouse.
Cover with no drip film
The drip-free membrane can overcome the disadvantages of a large number of water droplets attached to the inside of the membrane, significantly reducing 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 temperature and decreasing humidity.
Ventilation and dehumidification
Exhalation is the main measure of dehumidification. Generally, it should be carried out before and after noon, with the top wind and waistline prevailing. The footwell can't 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. In the hot season, early ventilation, strong wind, and late wind-breaking are required. Even on cloudy days, short-term ventilation is required when the outdoor temperature is high at noon. 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 to bring the air humidity down. However, the cooling caused by ventilation should be based on the premise that the crop does not suffer from chilling.
Reasonably watering
Watering is the main factor that causes the humidity in the shed to increase. The number of watering and the amount of water each time depends on the weather, soil conditions, the type of vegetables, growth period and growth potential, generally should be poured into small water or gutters, and avoid flooding or flooding. The colonization water and the slow seedling water of fruit and vegetable vegetables must be thoroughly irrigated, and the result should be sufficient water supply. In other periods, watering is generally not required. When the temperature in the shed is low, especially when it is not possible to vent the air, watering should be controlled as much as possible. Watering should be carried out on a sunny day from 10 to 12 o'clock in the morning, and it should be accompanied by ventilation and humidity. Water should not be poured 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.
Warming and dehumidification
For every 1°C increase in air temperature in the shed, the relative humidity in the air will drop by 3% to 5%. The method of increasing temperature and decreasing humidity can satisfy the temperature requirement of vegetables and reduce the relative humidity of air. When the plant grows to have strong resistance, the watering canopy can be heated up to 30°C for 1 hour and then ventilated and vented. After 3 to 4 hours, the temperature can be repeated once the temperature is below 25°C.
Dust method and smog method
The air humidity in the shed is inherently large, and the use of conventional spraying methods will increase the humidity, which is detrimental to the control of diseases. The use of dust and smog method can prevent air humidity from increasing due to spraying and improve the control effect.
Cultivated wet
When the temperature of the greenhouse is high, the surface is shallow and shallow, which can accelerate the evaporation of the surface soil, cut off the pores of the soil, and prevent the deep water from moving upwards, which also has a certain effect on reducing the humidity in the greenhouse.
Collagen Peptide,Hydrolyzed Collagen,Collagen Supplement,Hydrolyzed Bovine Collagen
Ningbo Nutrition Food Technology Co.,ltd. , https://www.collagenworkshop.com