Key points of ventilation in greenhouse in winter

Ventilation is essential when planting in the greenhouse. After entering winter, many growers feel that the temperature is too low, if ventilated, it is easy to cause freezing damage to vegetables, so they will not do ventilation work in winter. In fact, the greenhouse also needs ventilation in winter, but when there is ventilation in winter, there are a lot of things we need to pay attention to. Then the following editor brings you the precautions of greenhouse ventilation in winter, let's have a look!

I. points for attention

1. Ventilation time

In winter ventilation, we must pay attention to the ventilation time, not early ventilation, if the ventilation is too early. Then it will not only lead to a sudden drop in temperature in the greenhouse, vegetable crops can not adapt in time, resulting in a variety of physiological diseases. And the carbon dioxide produced by the greenhouse the night before is conducive to the photosynthesis of vegetable crops after the greenhouse is opened the next morning, thus producing photosynthetic substances. It can provide adequate nutrition for vegetables, and if ventilated too early, it will lead to a decrease in carbon dioxide concentration and a waste of carbon dioxide resources.

2. See the light after pulling the shed

In winter production, if the temperature is in a suitable environment, then the ventilation work should be done in time. Then, with the enhancement of the light, when the temperature of the greenhouse gradually rises to about 29 degrees, it should also be ventilated in time. Because in the overall environment, the carbon dioxide content in the greenhouse has been gradually consumed by photosynthesis. Therefore, it is necessary to ventilate in time and put in the right amount of carbon dioxide to ensure the normal photosynthesis of vegetables. And when the temperature of the greenhouse rises, reasonable ventilation is beneficial to reduce the humidity of the greenhouse and reduce the incidence of diseases.

Second, ventilation benefits

1. Temperature regulation

Winter ventilation is an effective measure to adjust the temperature in the greenhouse. Because in the greenhouse production, if the planting of crops is different, the temperature requirements are not necessary. For example, common cucumbers can generally grow at a temperature of about 30 degrees. Crops such as celery are not suitable to grow in a high temperature environment, if more than 25 degrees, it will affect their growth and development. And vegetable crops in the appropriate temperature range, the higher the temperature, the stronger the photosynthetic capacity. Therefore, reasonable ventilation in winter is the key to ensure safe overwintering and normal growth of vegetables.

2. Improve air quality

The greenhouse is in a closed environment, so if the ventilation is not done well, the air quality in the greenhouse is very poor. Especially in winter, many people will not pay attention to ventilation, resulting in frequent air damage, affecting the normal growth of vegetables. For example, if you use non-mature farm manure or fertilizers with high ammonia content, it will not only lead to overgrowth of vegetables, burning roots, and so on. It can also produce harmful gases, such as ammonia, which can cause fatal harm to vegetables. Therefore, it is necessary to do a good job in ventilation, discharge harmful gases from the greenhouse and improve air quality.

The above is a brief introduction to the matters needing attention in greenhouse ventilation in winter. That's all for today's introduction. This article is for reference only. I hope it can help you all.