What are the precautions for ventilating greenhouses in winter?

Greenhouse planting is now a very common planting model in our country. When carrying out greenhouse planting, because the entire greenhouse is in a closed state, ventilation work is very necessary. Even in winter when temperatures are low, ventilation is also essential. It is just that there are some precautions, so today the editor has brought you the precautions for ventilating greenhouses in winter. Let's take a look together!

1. Temperature

Because the temperature in winter is very low, when we ventilate the greenhouse, the first thing to pay attention to is temperature. When ventilating, we should observe the temperature conditions inside the greenhouse. Only when the temperature inside the greenhouse is higher than the suitable growth temperature range for the planted vegetables can ventilation work be carried out. This prevents the temperature inside the greenhouse from becoming too low after ventilation because cold air enters, causing frost damage to the vegetables and affecting their normal growth. Therefore, when ventilating, we must have a full understanding of the growth habits of the planted crops and clearly know the temperature requirements of the crop at each growth stage, so as to do a good job in ventilation.

2. Ventilation volume

When ventilating greenhouses in winter, we should follow the ventilation principles of from small to large and from less to more. Attention should be paid to the temperature differences in various places in the greenhouse. In locally high-temperature places, ventilation should be carried out appropriately earlier and the ventilation openings should be enlarged. On the contrary, in places with lower temperatures, ventilation should be carried out appropriately later. When ending ventilation work, the principle should be the opposite of that at the start of ventilation. During ventilation, prevent cold air from blowing directly onto the plants, causing the plants to grow in an environment with constantly fluctuating temperatures, leading to various adverse conditions such as frost damage to the vegetables, affecting normal growth and causing a decline in yield.

3. Ventilation time

Then what we also need to pay attention to is ventilation time. When ventilating, it should be carried out when the temperature inside the greenhouse is relatively high, the humidity ratio is large, and the crop's photosynthetic capacity is strong. Then, after applying water and fertilizer or spreading pesticides to the vegetables, the humidity inside the greenhouse will rise somewhat, so attention should also be paid to doing a good job of short-term ventilation. If there is a situation of long cloudy days followed by sudden clearing, the covering outside the greenhouse should be properly opened a little. Reduce the ventilation volume to prevent the sudden strengthening of light from accelerating water evaporation, thereby causing adverse phenomena such as water loss and wilting in the vegetables.

The above is a brief introduction to the precautions for ventilating greenhouses in winter. Ventilation work in winter greenhouses is very necessary, but we should also pay a lot of attention when ventilating and must not do it blindly. In particular, it should be carried out on the premise of ensuring temperature, so as to ensure that the vegetables can overwinter safely. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!