Matters needing attention for ventilation of greenhouse in winter

Greenhouse planting is now a very common planting pattern in our country. When planting in the greenhouse, because the whole greenhouse is in a closed state, so ventilation is very necessary. Even when the temperature is low in winter, ventilation is essential. It's just that there are some matters needing attention, so the editor brings you some matters needing attention in winter greenhouse ventilation today. Let's take a look!

1. Temperature

Because the temperature in winter is very low, the first thing we should pay attention to when ventilating the greenhouse is the temperature. During ventilation, we have to observe the temperature in the greenhouse. Only if the temperature in the greenhouse is higher than the suitable growth temperature range for growing vegetables can ventilation be carried out. Prevent after ventilation, because the cold air enters, causes the temperature in the shed to be too low, and causes the vegetable to appear the frost injury, affects the vegetable normal growth. Therefore, when we are ventilated, we must have a full understanding of the growth habits of crops and the temperature requirements of each growth stage of the crop, so as to do a good job of ventilation.

2. Ventilation rate

When the greenhouse is ventilated in winter, we should take the principle of ventilation from small to large, from less to more, etc. Attention should be paid to the temperature difference in various places in the greenhouse, and in local high-temperature places, early ventilation should be appropriate and ventilation vents should be expanded. On the contrary, where the temperature is lower, it should be properly ventilated late. At the end of the ventilation work, it should be contrary to the principle of starting ventilation. When ventilating, it is necessary to prevent the cold wind from blowing directly to the plant, causing the plant to grow in an environment where the temperature varies from high to low, resulting in freezing injury of vegetables and other adverse conditions, affecting normal growth and resulting in a decline in yield.

3. Ventilation time

Then the next thing we need to pay attention to is the ventilation time. When ventilating, it should be carried out when the temperature in the greenhouse is high, the humidity proportion is high and the crop photosynthetic capacity is strong. Then after applying water and fertilizer or spraying chemicals to the vegetables, the humidity in the shed will increase, so we should also pay attention to do a good job of ventilation for a short time. If you encounter a long overcast sudden sunny situation, the mulch outside the greenhouse should be opened properly. Reduce the amount of ventilation to prevent the light from suddenly becoming stronger, resulting in faster water evaporation, resulting in the loss of water and other adverse phenomena in vegetables.

The above is a brief introduction to the matters needing attention in greenhouse ventilation in winter. Winter greenhouse ventilation work is very necessary, but we should also pay more attention to ventilation, not blindly. In particular, it should be carried out under the premise of ensuring the temperature to ensure that vegetables can survive the winter safely. That's all for today's introduction. This article is for reference only. I hope it can help you all.