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In different greenhouses, even if the vents are opened to the same size at the same time, the temperature inside each greenhouse may not be the same. The answer is no. However, many vegetable farmers focus only on the size of the vents when ventilating, without considering the structural differences between greenhouses.
Because of variations in height and roof shape, the airflow movement during ventilation differs significantly, leading to different cooling effects. In smaller greenhouses, hot air doesn't efficiently escape through the top vents, so even if they are fully open, the cooling effect remains limited. This means that under the same weather conditions, a high-roofed, arched greenhouse can effectively lower temperatures by opening the ceiling vent by 40 centimeters. In contrast, a smaller greenhouse with a wider top vent (up to 60 cm) may not achieve the same temperature drop.
Therefore, when ventilating, farmers should adjust the vent size based on the actual temperature inside the greenhouse rather than relying solely on the vent’s width. It's recommended that each greenhouse have 2 to 4 thermometers placed strategically. When the temperature doesn’t decrease enough through the top vents, it's time to open the front vents as well. This helps improve air circulation through the aisles, enhancing overall cooling.
Additionally, for crops that require less sunlight, farmers can further reduce temperatures by applying mud on the greenhouse film or using shade nets. However, care must be taken not to cover the vents with the shade net, as this could block the release of hot air and reduce the cooling efficiency. Proper ventilation is key to maintaining an optimal growing environment.