Vegetable farmers friends know that the high humidity in the shed is one of the main factors for the high incidence of diseases in winter. If the humidity can be reduced to a suitable range, the incidence of vegetables in the greenhouse will be greatly reduced. Here are a few simple and effective dehumidification methods, which have low cost and good results.
Avoid dew condensation on the shed film. The inside of the shed film is prone to dew. If the shed film has poor anti-fogging and dripping properties, a large number of water droplets will accumulate on the shed film, which will not only increase the humidity in the shed, but also refract the light and make it pass through the shed. The direct light of the film becomes scattered light, which causes the illumination in the shed to decrease. Vegetable farmers are advised to choose anti-fogging film from large manufacturers. Of course, the anti-mist flow drops on the shed film have a shelf life. Generally, its duration is about 3 to 6 months, and the shed film will lose its dripping function over time. In winter, if the condensation of the greenhouse film is found to be serious, you can use organic silicon spray with water to improve the ductility of the water droplets on the greenhouse film and reduce the condensation of the greenhouse film.
The mulching film + organic matter reduce the evaporation of water. The purpose of covering the mulch is to reduce the evaporation of water into the air. It is best to use an arch mulch to reduce the evaporation of water and increase the temperature of the ground.
The second is to cover the operation with organic matter. Covering some organic matter with good air permeability and moisture absorption, such as rice husk, can reduce evaporation and can also absorb moisture. More importantly, it has good air permeability after laying, and the rice husks can be turned into the soil when changing the stubble, which can improve the soil and increase the soil fertility after decomposition. Can also cover crushed corn, wheat straw and peat.
The temperature in the humidifying shed is increased when the temperature is increased and the air is released, and the relative humidity is naturally small. At the same time, the increase of the temperature in the shed can speed up the gas exchange with the outside and discharge the humidity to the outside of the shed to achieve the purpose of reducing humidity. Increasing the light in the shed in winter is the most critical measure to increase the temperature. Vegetable farmers can wipe the shed film, increase the light transmission of the shed film, and hang a reflective curtain or fill light to increase the temperature.
Ventilation and humidity, we must grasp the ventilation time. After pulling up the covering in the morning, don't rush to release the wind first. The shed is closed for half an hour to one hour. After the temperature in the shed has increased, you can use a small wind to dehumidify. Close the ventilation openings to continue warming at half an hour. In the case of growth, increase the temperature as much as possible, and then pull the air vent to ventilate. In the afternoon, close the air vent when the temperature drops to about 25 ° C. The humidity in the shed will increase between the time when the air vent is closed and the time when the cover is placed. It is recommended to ventilate for another 10 to 15 minutes half an hour before the cover is placed. , Can effectively reduce the humidity in the shed at night.
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