At present, the outside temperature is low, vegetables are closed for a long time, and the humidity in the shed is relatively large. Especially after watering, many vegetable farmers have problems such as roots and multiple diseases due to improper ventilation management, which affects the growth of vegetables.
First, there are problems
1. Open the vent immediately after watering. It will keep the temperature of the shed at a low level, and it is prone to damage, which leads to weak absorption.
2. After watering, the temperature is too high and not ventilated. It is right to increase the temperature of the shed after watering, but it must not be ventilated for a long time. The moisture in the shed can not be discharged. When the temperature drops at night, more dew will form, which is more conducive to pathogen infection.
3. Zoom in on the wind. After the greenhouse is warmed up, the fierce amplification of the wind will cause a "flash tree" and vegetables will appear wilting.
Second, release advice
Water should be selected in the morning on sunny days, and the vents should be kept closed until the temperature in the shed rises above 30 °C. Open the small opening for half an hour, then close the vents and keep the temperature in the shed at 30 °C. After half an hour. Then open the small mouth ventilation until 2 or 3 o'clock in the afternoon, the temperature in the shed will drop to 23 °C ~ 25 °C, close the vent. 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.
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