Vegetable farmers know that the high humidity in the shed is one of the main factors for the high incidence of diseases in early winter. If the humidity can be reduced to a suitable range, the incidence of vegetables in the shed will be greatly reduced. Here are several simple and effective methods of dehumidification, with low cost and good effect.
Avoid condensation of greenhouse film
Condensation is easy on the inside of the shed film, and 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 change the direct light that originally passed through the shed film. In order to scatter the light, the illuminance in the shed is reduced. It is recommended that vegetable farmers choose the anti-fog dripping film from large manufacturers.
Of course, the anti-fog dripping agent on the greenhouse film has a lasting period. Generally speaking, its duration is about 3 to 6 months, and the shed film will lose its dripping function over time. If it is found that the shed film has serious condensation, use the silicone spray with water to increase the ductility of the water droplets on the shed film and reduce the shed film condensation.
Mulch + organic matter reduces water evaporation
One is the arching of the mulch for planting rows. The purpose of mulching film is to reduce the evaporation of water into the air, but if the mulching film is attached to the ground, a large amount of water will be stored on the mulching film when watering, which will not reduce the evaporation. Therefore, the mulch film is arched and mulched, which not only reduces water evaporation, but also has a good effect of increasing the ground temperature.
The second is to cover organic matter. Cover some organic matter with good air permeability and moisture absorption, such as rice husk in the operation line. After the operation line covers the rice husk, it not only reduces evaporation, but also absorbs moisture. More importantly, it has good air permeability after laying and will not cause soil compaction, and turning the rice husk into the soil when changing the stubble can improve the soil, increase the air permeability of the soil, and increase the soil strength after decomposition. It serves multiple purposes. Or covered with crushed corn and wheat straws, the moisture absorption effect is better than rice husks, and these crop straws can also release heat and carbon dioxide during the decay process, increasing the temperature in the shed and the photosynthesis of vegetables.
Conditional vegetable farmers can also lay peat, which has the characteristics of tasteless, soft texture, good water absorption and water retention, and rich in organic matter and humic acid. Laying grass charcoal in the operation line has better moisture absorption effect than rice husk and straw. It is also a good organic fertilizer used in the soil. It is understood that the price of peat is generally around two or three hundred yuan per square, and vegetable farmers can choose according to the actual situation.
Increase the temperature + let the wind accelerate the dampness
When the temperature inside the shed is high, the relative humidity will naturally decrease. At the same time, the increase in the temperature inside the shed can speed up the exchange of air with the outside world, and discharge the moisture outside the shed to achieve the purpose of dehumidification. Increasing the light in the shed is the most critical measure to increase the temperature. Vegetable farmers 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 ventilation time. After pulling up the cover in the morning, do not rush to let the air out. The shed room is airtight for half an hour to one hour. After the temperature in the shed room has increased, a small air can be used to remove humidity. After half an hour, the vents can be closed to continue to increase the temperature without affecting the vegetables. In the case of growth, try to raise the temperature as much as possible, and then pull a large air vent for ventilation. In the afternoon, close the vent when the temperature drops to about 25°C. The humidity in the shed will increase during the period from closing the vent to putting the cover. It is recommended to ventilate for 10-15 minutes before putting the cover half an hour. , Can effectively reduce the humidity in the shed at night.
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