In spring, the light intensity increases, and the ground temperature gradually rises. When the weather is fine, the temperature of the shed is often above 30°C around the noon. To prevent the high temperature, some vegetable farmers have taken a one-time approach to expand the bleeder outlet. However, after one-time expansion of the air outlet, There have been many ills. Master Guo’s greenhouse vegetable was damaged.
Even after the cloudy days, the weather has improved. Master Guo quickly opened up the vents on the upper part of the greenhouse to cool it down. However, when he went to lay grass in the afternoon, he discovered that the entire air outlet was basically closed by the wind. Although the plants were slightly sluggish at the time, Master Guo was not attentive. As a result, the leaves of many vegetables on the second day began to show signs of repelling green spots that resembled high-temperature obstacles. This made it clear that their own negligence caused damage to greenhouse vegetables.
For this reason, vegetable growers are advised to pay more attention to the air outlets in the spring. On the one hand, when the spring is windy, if the air outlet is not properly set, it may cause the air outlet to be blown closed, which may lead to excessive temperature in the greenhouse. On the one hand, the air outlet is pulled at a time, which can easily lead to cold air blowing directly outside the greenhouse. , Which in turn led to the wilting of the young leaves of the shed vegetables and even the appearance of green spots.
So how much is it suitable for the air outlet to be opened? For the situation that the outside temperature in early spring is still low, it is recommended to change the practice of opening the vent once and closing it once in a single step to gradually open and close the vent in two steps, that is, to open the vent at around 9.00 am Centimeter, and when to add carbon dioxide; before 10:30 and then widened it to about 15 cm, so that the temperature inside the shed was maintained at 25 °C -28 °C; in the afternoon also close the vent outlet in two intervals, so that the temperature before the laying grass at 20 °C Right and left is appropriate.
In view of the characteristics of the spring wind, it is recommended that when the farmer opens or closes the air outlet, if it is a hand pull grass, every 5-10 meters, will be a little downhill grass, put it to the outlet, so that it The film of the air outlet; if a shutter is provided, the roll rod can be rolled up to the upper side of the air outlet, and the air outlet film can be pressed to avoid being blown by the wind or blowing the air outlet.
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