How to ventilate vegetable planting in greenhouse

Ventilation methods for vegetable planting in greenhouse;

First, the wind direction is different, and the sizes of the air outlets on both sides of the shed are different: when the west wind blows, the vegetables on the west side of the shed are blocked by gables, so there is relatively little hot air in the shed and the temperature is high, so the air outlet on the west side of the shed should be added when the wind is released. When the east wind blows, it is just the opposite. When the temperature in the shed drops in the afternoon, if it is a westerly wind, the air outlet on the east side of the shed should be closed first, leaving a gap in the air outlet on the west side of the shed. When the wind blows south or north, the air outlets on the east and west sides of the greenhouse can be opened to the same size. Only by properly adjusting the size of the air outlets on both sides of the greenhouse according to the different wind directions can the temperature in the greenhouse be consistent and the synchronous growth of vegetables be promoted.

Second, attention should be paid to ventilation in stages: after opening the shed for one hour in the morning, open the seal for about 3-5cm, let out a little wind, discharge moisture in the shed, and replenish carbon dioxide in the shed to replenish raw materials for the smooth photosynthesis. When the temperature in the shed rises above 28℃, gradually open the air outlet and keep the temperature in the shed below 33℃.

Third, due to the strong wind in spring, the wind outlet should pay attention to wind prevention: increase the density of wind rope, and it is best to use wide cloth strips with large friction for wind rope. This kind of cloth has high friction when tying slipknot to fix the shed film, and the slipknot is not easy to be blown loose by strong wind. Many vegetable farmers want to use nylon rope as windbreak rope conveniently. Because of the low friction, vegetable farmers should appropriately increase the density of nylon windbreak rope and fix it to prevent the tuyere from being blown by the wind. At the same time, vegetable farmers should pay attention to check at any time in windy weather to prevent the wind rope from loosening and the tuyere from closing.