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These two processes are similar from a physical point of view, since they are characterized by the movement and replacement of air. But they also have significant differences.

A draft is a flow of air that blows through a room through openings that are located opposite each other. This is a “room wind” that occurs when doors or windows in opposite parts of the greenhouse are opened at the same time. In this case, uncontrolled air exchange occurs.

Ventilation is natural air exchange that does not require additional effort. This is done by opening the windows located on one side of the greenhouse. In this case, air flow circulation should be created throughout the entire area of ​​​​the room.

Why should you avoid drafts in Your greenhouse?

Despite the fact that both procedures provide air replacement, ventilation is necessary for plantings, and drafts are harmful to them. It disrupts the microclimate around plants and replaces moisture-saturated air with dry air. As a result, the evaporation process is activated, which leads to drooping and wilting of the leaves. In addition, a draft causes a sharp temperature change, which causes thermal shock in plants. This can cause even the most unpretentious greenhouse crops to catch cold.

Please note! A draft is especially dangerous if the air flow speed exceeds 1 meter per second..

What plants are afraid of drafts in a polycarbonate greenhouse?

Different cultures have different requirements for temperature, humidity, and ventilation. They also treat drafts differently.

Cucumbers

For normal development and fruiting, cucumbers need warmth and humidity. They feel great even in stagnant air and do not tolerate drafts at all. To prevent the development of diseases, regularly ventilate the greenhouse using vents on the door or roof.

Peppers and eggplants

These crops tolerate temporary drops in temperature and stagnant air, but are very afraid of drafts. Peppers and eggplants are ventilated using vents on the roof of the greenhouse.

Tomatoes

Tomatoes, unlike other greenhouse crops, prefer coolness and a light draft. They absolutely cannot tolerate stagnant air, because in such conditions late blight actively develops, and the pollen becomes sterile and fruits are not set. Ventilate the greenhouse with tomatoes regularly, and in hot weather leave the doors wide open.