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Greenhouse vegetables are not immediately ventilated after watering
Some vegetable farmers tend to ventilate the greenhouse right after watering, aiming to lower the humidity. However, this practice is actually not recommended. Instead, it's better to first raise the temperature inside the shed before ventilating. This is because the water used for irrigation is typically cooler than the soil, and it can temporarily lower the ground temperature. When the soil is too cold, the root system of the vegetables becomes less efficient at absorbing water and nutrients, which can hinder their growth. Moreover, cold soil can damage the delicate root hairs, further slowing down the overall development of the plants.
By allowing the temperature in the greenhouse to rise first, the soil warms up gradually, helping the roots recover and function more effectively. Once the temperature has increased, proper ventilation can then be introduced. This not only helps the ground temperature return to a normal level faster but also increases the air’s capacity to hold moisture, making it easier to remove excess humidity from the greenhouse. The relationship between temperature and humidity is crucial—when it's cold, the air can't hold as much moisture, leading to higher relative humidity, which makes it harder to reduce moisture through ventilation alone.
In addition, raising the temperature after watering can have an added benefit: it helps suppress many common greenhouse diseases. For example, during winter and spring, many plant diseases are caused by low temperatures, such as downy mildew. Increasing the temperature can create an environment that is less favorable for these pathogens, reducing their spread and impact. Many experienced farmers have successfully used this method to manage disease outbreaks in their crops.
Therefore, it's important for vegetable farmers to avoid immediate ventilation after watering. Instead, they should wait until the greenhouse temperature reaches around 33°C (the exact temperature may vary depending on the crop) before opening the vents. This approach not only supports healthy plant growth but also improves the overall climate inside the greenhouse, leading to better yields and fewer disease problems.