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 shed will be greatly reduced.
Avoid condensation of greenhouse film
Condensation is easy on the inside of the shed film. 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 reduce the illuminance in the shed. It is recommended to choose the anti-fog dripping film from a large manufacturer. The anti-fog dripping agent on the shed film has a lasting effect. Generally speaking, the validity period is 3-6 months, and the shed film will lose its dripping function over time. In winter, if you find that the shed film is severely dew, you can use the silicone water spray to improve the ductility of the water droplets on the shed film and reduce the shed film condensation.
"Mulch + organic matter" reduces water evaporation
The mulch for planting rows is arched. The purpose of the mulching film is to reduce the evaporation of water into the air, so that it can not only reduce the evaporation of water, but also improve the ground temperature.
The operating line covers organic matter. Cover some organic matter with good air permeability and moisture absorption in the operation line, such as rice husk, which can reduce evaporation and can also absorb moisture. More importantly, it has good air permeability after laying, and the rice husk is turned into the soil when changing the stubble, which can improve the soil and improve the soil strength after decomposition. It can also be covered with crushed corn, wheat straw and peat.
"Rising temperature + letting out the wind" accelerate the dampness
As the temperature inside the shed becomes high, the relative humidity naturally decreases. The increase in the temperature inside the shed can accelerate the gas exchange with the outside, and discharge the moisture outside the shed to achieve the purpose of cooling down. Increasing the light in the shed in winter is a key measure to increase the temperature. You can wipe the shed film to increase the transmittance of the shed film, and hang reflective curtains or fill lights to increase the temperature.
To ventilate and disperse dampness, grasp the time. After pulling up the cover in the morning, do not rush to let the wind go. The shed room is airtight for half an hour to one hour. After the temperature in the shed room rises, a small air can be used to remove humidity. After half an hour, close the vent and continue to raise the temperature. In the case of not affecting the growth of vegetables, try to increase the temperature as much as possible, and then open the large air vents for ventilation. In the afternoon, close the vent when the temperature drops to about 25 degrees Celsius. During the period from closing the vents to putting the covering, the humidity in the shed will increase. It is recommended to ventilate for 10-15 minutes before putting the covering half an hour to effectively reduce the humidity in the shed at night.
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