As the outside temperature continues to decrease, the closing time increases, and the humidity in the shed increases. Especially after watering, many vegetable farmers have problems such as roots and multiple diseases due to improper ventilation management.
problem
Immediately after watering, the temperature in the shed is obviously reduced after the water is turned on. If the water is ventilated after watering, the temperature in the shed will remain at a low level, and the ground temperature will naturally not rise. When the root system is in a low ground temperature environment for a long time, it is prone to root injury, which leads to its weak ability to absorb fertilizer and water, and the growth and development of vegetables are hindered.
It is correct to raise the temperature in the shed after the watering is too high without watering the water, but it must not be ventilated for a long time in order to increase the temperature of the greenhouse. After watering, it is required to close the vents, which is to facilitate the discharge of moisture in order to increase the temperature. If the vegetable grower has closed the vents, the moisture in the shed will not be discharged, and when the temperature drops at night, more dew will be formed, which is more conducive to Pathogen infection. Moreover, the ventilating port is not opened, and the carbon dioxide in the shed is lacking, the photosynthesis is stagnant, the plant is lack of nutrition, and the plant resistance is reduced, which is not conducive to the normal growth of vegetables.
Although the vegetable grower understands that the temperature rise time after closing the shed should not be too long, after a certain period of time, the vegetable grower will start to release the wind, and one step in place, and then carry out other operations. It is important to close the shed, but the method of releasing the wind is also extremely critical. After the shed is warmed up, the violent release will cause “flashing treesâ€, and the vegetables will appear wilting, affecting normal growth.
Suggest
Watering should be selected after clearing the shed on a sunny day, keep the vents closed, until the temperature in the shed rises above 30 °C, open the small opening for half an hour, then close the vents, keep the temperature in the shed at around 30 °C, half After a few hours, open the small mouth ventilation... Continue until 2:30-3:00 pm, the chamber temperature drops to 23-25 ​​°C, close the vents. When the temperature in the shed is lowered to about 20 °C, open the small mouth for 15 minutes, then cover the quilt or grass hoe for heat preservation.
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