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Greenhouse vegetables should not be immediately ventilated after watering
Vegetable farmers often rush to ventilate their greenhouses right after watering, aiming to lower humidity. However, this practice is not always the best approach. In fact, it may do more harm than good. Instead of ventilating immediately, it's better to first raise the temperature inside the greenhouse before opening the vents.
After watering, the soil temperature tends to drop because of the cold water. This can slow down the plants' ability to absorb water and nutrients, and it can also damage the delicate root hairs, which are crucial for healthy growth. If the ground remains too cold, it can severely hinder plant development. By allowing the temperature to rise first, you help the soil warm up faster, which supports better root function and nutrient uptake.
Once the temperature has increased, proper ventilation becomes much more effective. It helps to remove excess moisture from the air, reduces humidity in the greenhouse, and creates a healthier environment for the crops. The relationship between temperature and humidity is key here—lower temperatures mean the air holds less moisture, making it harder to reduce humidity through ventilation alone.
In addition to improving conditions for plant growth, raising the temperature after watering can also help prevent diseases. Many common greenhouse diseases, especially during winter and spring, thrive in cool, damp conditions. By increasing the temperature, you create an environment that’s less favorable for these pathogens. For example, high temperatures are often used to control diseases like downy mildew, which is a common problem in many vegetable crops.
So, it's important for farmers to avoid immediate ventilation after watering. Instead, wait until the greenhouse temperature reaches around 33°C (though this may vary slightly depending on the crop) before opening the vents. This strategy not only protects the plants but also helps manage disease risks more effectively. Taking the time to adjust the temperature first can make a big difference in overall crop health and yield.