Ventilation management of greenhouse in spring
First, the arch is different, the size of the vent is different
The size of the spring tuyere cannot be completely defined by a single data, because the structure of the greenhouse is different, and the time and speed of cooling are also different. Large arch of the greenhouse, because the arch of the shed surface is suitable, the hot air flow is easy to discharge along the upper part of the greenhouse film, even if the air outlet is small, it can achieve better ventilation effect. The planting years are longer and the low old shed, because the greenhouse arch is smaller, the shed surface is relatively flat, the hot air flow in the shed is slow from the vent, and the temperature in the shed is high. Under normal circumstances, such a greenhouse will open the top vent to 40 centimeters wide, and the higher height, larger arch of the greenhouse tuyere opened to 30 centimeters of the same effect.
Second, pay more attention to ventilation in spring
After opening the shed for 1 hour in the morning, open the upper tuyere about 3-5 cm to let out a small wind, the purpose is to discharge the moisture in the shed, and supplement the carbon dioxide in the shed to supplement the raw materials for the smooth progress of photosynthesis. When the temperature of the shed rises to more than 28 ° C, the air outlet will be gradually opened, and the temperature in the shed will not exceed 33 ° C (for cucumbers, loofah and other warm vegetables).
Third, there are many strong winds in spring, and pay attention to wind proofing at the vent
Increase the density of the wind rope, and the wind rope is best to use a wide cloth with greater friction, this cloth in the slipknot fixed shed film, friction is large, slipknot easy to be blown loose by the wind. Many vegetable farmers want to facilitate the use of nylon rope as a windproof rope, because the friction is less, the vegetable farmers should appropriately increase the density of nylon wind rope, and fix it to prevent the wind from blowing close. At the same time, vegetable farmers should also pay attention to check at any time in windy weather to prevent loose wind rope and closed tuyere.
