Ventilation and ventilation are required during the growth of greenhouses in greenhouses. The purpose is to regulate the temperature, humidity, carbon dioxide concentration, and discharge harmful gases in the greenhouse. Farmers should apply proper techniques to minimize the effect of ventilation on the growth of vegetables during ventilation.
1. Temperature requirements. According to the temperature requirements of the various stages of growth and development of the vegetables in the greenhouse, the ventilation of the greenhouse must be performed when the temperature in the greenhouse is higher than the temperature at which the vegetables are grown, so as to prevent cold injury or frost damage.
2. Air volume requirement. Ventilation and ventilation in the greenhouse Adhere to the principle of small to large, windward release, pay attention to adjust the local temperature difference in the shed, relatively early ventilation at high temperatures, put a larger tuyere; at relatively low temperature ventilation, put a small tuyere. At the same time, cold winds are prevented from blowing directly to vegetable plants, causing freezing damage to the leaves and young fruits of the vegetables. Close the air outlet should be from large to small, from more to less gradually.
3. Time requirements. The purpose of ventilation and ventilation is to reduce temperature and humidity and supplement carbon dioxide. The time is generally controlled when the temperature in the greenhouse is too high, the relative humidity is relatively high, and the photosynthesis of vegetables is accelerated. Usually ventilation is carried out 1 to 2 hours after the curtain is opened on a sunny morning.
In addition, after watering, fertilizing or spraying pesticides, it should be ventilated for a short period of time; in rainy weather, when the relative humidity in the shed is large, carbon dioxide is deficient, and harmful gases are accumulated, small winds should be released for a short time; In the event of a long period of overcasting, the "outer shade" is applied to the outside cover to put a small breeze at the same time.
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