What are the latest methods for ventilating greenhouses in winter?
Greenhouse cultivation is a major cultivation mode that can effectively regulate the temperature and humidity of growing. Greenhouses can be used for off-season cultivation and so on, and their economic benefits are very good. And when we carry out greenhouse cultivation, ventilation work is very important. Especially in winter, so how should a winter greenhouse be ventilated? Below, the editor will give you a brief introduction, let's take a look together!
1. Install buffer film
First, we should install buffer film at the ventilation point. Buffer film can prevent weeds, dust and so on outside the greenhouse from entering the greenhouse and falling onto plant leaves. This affects the photosynthesis of crops, but its main role is still to prevent cold air from blowing directly onto the crops during ventilation. This causes rapid changes in the temperature and humidity on the surface of vegetables, resulting in phenomena such as dry edges and chapped skin, and the buffer film can play a protective role for the growth of vegetables. After the buffer film is installed, the cold air outside will be pushed by the buffer film to the back wall after entering the greenhouse, which can extend the distance for the cold air to reach the vegetables. This provides time for convection between the cold air and the hot air inside the greenhouse, preventing various adverse phenomena in vegetables.
2. Ventilate after watering
After watering inside the greenhouse, the ground temperature will begin to drop noticeably. If ventilation is carried out after watering, then the temperature inside the greenhouse will remain low for a long time. And if vegetables are in a low-temperature environment for a long time, the damage to the roots is very great, thus affecting the roots' ability to absorb wastewater. However, after watering, it is also not possible not to water. If the ventilation openings are always kept closed, the humidity inside the greenhouse will be too high, and when the temperature drops at night, a lot of dew will be produced, thus causing infection by pathogenic bacteria. Moreover, it will also reduce the carbon dioxide content, affecting the photosynthesis of crops, which is very unfavorable to the growth of vegetables.
3. Reasonable ventilation
When the greenhouse is just opened, because the temperature inside the greenhouse is similar to the temperature of the plants. Therefore, no dew droplets will be produced on the vegetable plants, but as the temperature of the plants inside the greenhouse continues to rise. The temperature of the plants rises more slowly than that of the greenhouse, causing too great a temperature difference. This causes dew droplets to appear on the vegetables. If ventilation is carried out at this time, the entry of cold wind will blow dry the dew droplets, causing dry leaves and chapped skin. When the temperature inside the greenhouse is too high, ventilation should be carried out gradually, and the vents should not be fully opened all at once. If the temperature changes greatly, it is very unfavorable to the growth of vegetables.
4. Ventilation on cloudy days
In greenhouse cultivation, cloudy days are the weather that growers least want to see. If managed improperly, the impact on the growth of vegetables is very great. Especially for melon and bean vegetables, some growers, in order to ensure the temperature inside the greenhouse, choose not to ventilate on cloudy days, which is very unfavorable to the growth of vegetables. On cloudy days, if the temperature inside the greenhouse is suitable, we must also open the ventilation openings for ventilation. But pay attention to the ventilation time, and it should not be too early, to prevent the temperature inside the greenhouse from being too low.
The above is a brief introduction to how to ventilate a winter greenhouse. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!