How to release the air after installing the 60-mesh insect net in the greenhouse
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When interviewed by reporters in Tianliu Township, Shouguang City, many farmers who planted summer tomatoes reported to reporters that in order to prevent the virus disease, they installed 60-mesh insect nets in the upper and lower air outlets of greenhouses, so that they could completely remove smoke from the sheds. Insects such as whiteflies are blocked to prevent the transmission of viruses and other pathogens outside the shed to the shed, reducing the incidence of tomatoes. However, this has a great impact on the ventilation and cooling of greenhouses. Even if shade nets are used to cool down, the temperature is still high because of the poor air circulation in the sheds, and the maximum temperature in the shed is maintained above 35°C. Then, how should the vegetable growers cool off after installing the 60-mesh insect net?
First of all, for greenhouses equipped with 60-mesh insect nets, vegetable farmers can no longer install windshields. In the past, when the vegetable farmer installed a windshield film, they were all blown into the greenhouse in order to avoid the cold wind outside the greenhouse and to prevent the skin of the tomato planted in the greenhouse from appearing. But now after using a high-density insect net, the insect net will block the cold air outside the shed, slow down the speed of cold air entering the greenhouse, and allow the cold air to warm up in the process of entering the greenhouse. It can also avoid cold air. Dirty tomato skin. In addition, in the greenhouse where high-density insect nets are installed, the windshield membrane will also affect the air circulation in the shed, which will reduce the ventilation and cooling effect of the greenhouse. Therefore, vegetable farmers should remove the windshield from the shed.
Second, the maximum height of the shed is up and down. Now the straw screen on the greenhouse has been removed, and the air outlet at the top of the greenhouse can be opened to the maximum, that is, the air curtain can directly reach the south edge of the back slope of the greenhouse. After increasing the air outlet, the high temperature air inside the shelter can be accelerated. discharge. For the air outlet at the front face of the greenhouse, the vegetable grower can directly stretch the membrane to the membrane wire at the front face of the greenhouse, and increase the amount of cold air entering the shed by increasing the air vent to accelerate the air flow and reduce the temperature of the greenhouse.
Again, because the current temperature is generally no lower than 15 °C. Therefore, as long as it is on a sunny day, the vegetable grower can open the up and down vents of the greenhouse day and night, and when the temperature is low on cloudy nights or when it is raining, the up and down vents of the greenhouse can be closed.
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