Detail one: Ventilation should be carried out in several stages
Sunny days should be ventilated 1 hour after the removal of the blanket. When the ventilation is made, a small mouth is opened first. With the increase of the temperature in the shed, the ventilation openings are gradually enlarged to facilitate the entry of carbon dioxide outside the shed into the shed and promote the photosynthesis of vegetables. Do not close the vents all at once in the afternoon. Close the vents gradually. The vents can be closed halfway and the vents completely closed after 30 minutes. The vent can also be closed first, and then the vent can be opened and ventilated to cool down for 10-15 minutes. This is repeated twice. When the temperature in the booth is stable at about 15°C, the vent can be completely closed.
If you encounter cloudy days and the outside temperature is low, the greenhouse should be insulated, but it should not be unventilated. If it is not ventilated, the humidity in the greenhouse is too large, which will provide conditions for the spread and spread of the disease.
Ventilation should be carried out between 12 noon and 2 pm. Ventilation openings should be 10 cm wide. Ventilation should be 10-15 minutes each time. Ventilation should be performed once every 20-30 minutes. Continuous ventilation can be performed 2 or 3 times. Very good dehumidification.
Detail 2: Adding light is a must
After entering the winter, lack of light has become an important cause of the increase in vegetable production. Most growers know that setting up a light curtain in a shed is conducive to the growth of vegetables. However, some vegetable farmers hang the reflective screen too low, and the vegetable plants can easily block the light, which results in poor use of the reflective screen. When hanging the light curtain, a light curtain with a width of 1 to 1.2 meters should be hung on the back wall at a height of 1.7 meters. Do not hang the light curtain on the entire back wall of the shed to prevent it from reducing the heat storage capacity of the back wall. For vegetables such as cucumbers and loofahs, which require strong light, special light can be installed in the shed to fill the light for 2 to 3 hours, prolonging the time for lightening the vegetables to promote the accumulation of organic substances in the vegetables and increase the yield.
Detail 3: Hanging Hygrometer in Shed
Controlling humidity is one of the focuses of vegetable management in winter greenhouses. Now, many vegetable farmers know that the humidity in the shed is between 70% and 80%. However, because many sheds do not have hygrometers attached, vegetable growers cannot accurately control the humidity in the shed, resulting in multiple diseases. Therefore, hygrometers should be hung in the shed, which is especially important for newcomers to vegetables. When the humidity in the greenhouse is too high, the vegetable farmer can also apply ground ash to the ground to reduce the humidity.
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