Grasp the appropriate temperature The ventilation must be carried out when the temperature in the greenhouse is higher than the temperature suitable for the growth of the specific vegetable to prevent freezing or cold damage to the vegetables caused by the low temperature in the room after ventilation. Therefore, it is necessary to understand and grasp the temperature requirements of various stages of growth and development of various vegetables, and the ventilation temperature must not be lower than the required temperature of the vegetable species in the present growth and development stage.
Grasp the appropriate amount of ventilation when ventilating shed vegetables should adhere to the principle of small to large, from less to more, downwind to the wind. At the same time, we must also pay attention to the adjustment of the local temperature difference in the shed, to relatively early ventilation at high temperatures, put a larger tuyere; at a low temperature to relatively late release, put a small tuyere. When the air outlet is closed, it should be from large to small, gradually from more to less. In addition, when ventilating and ventilating, cool air should be prevented from blowing directly into vegetable plants in the shed, causing the temperature to fluctuate, causing leaves and young fruits to suffer freezing damage.
The purpose of proper ventilation and ventilation is to remove moisture and cool down, to meet the demand of carbon dioxide for photosynthesis of vegetable plants in greenhouses, and to remove harmful gases. Therefore, the ventilation and ventilation time should generally be higher in the greenhouse, relatively high relative humidity, and photosynthesis to accelerate, that is to say, 1 to 2 hours after the sunny morning of the curtain. In addition, after watering and fertilizing, spraying pesticides, due to increased humidity, ventilation should also be short-term. In cloudy snow weather, when the indoor relative humidity is high, carbon dioxide is deficient, and harmful gases are accumulated, a small amount of wind should be released for a short period of time to meet the demand for carbon dioxide from vegetable plants and reduce the consumption of nutrients in the plant. Improve plant resistance to cold. If there is a long period of overcasting, it is necessary to make a separate curtain on the coverings outside the shelter. The amount of air to be blown off should be small to prevent the light from being excessively strong and the transpiration will intensify, causing the plants to lose water and wilt.
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