In order to prevent virus disease, 60 mesh insect proof net is installed in the upper and lower air outlets of the greenhouse, which can completely block the pests such as Bemisia tabaci outside the shed, prevent the virus and other pathogens outside the greenhouse from being brought into the shed by the virus carrying pests, and reduce the incidence of vegetable disease.
This also has a great impact on the ventilation and cooling of the greenhouse. Even if the sunshade net is used to cool the greenhouse, the temperature is still high due to the poor air circulation in the shed, and the maximum temperature in the shed is still above 35 ℃. So, how should vegetable farmers cool down after installing 60 mesh insect proof nets?
Open the upper and lower air outlet of the greenhouse to the maximum. Now the straw curtain on the greenhouse has been removed, and the vent on the top of the greenhouse can be opened to the maximum, that is, the vent film can directly support the south edge of the back slope of the greenhouse. By increasing the air vent, the high-temperature air in the shed can be accelerated.
As for the air vent at the front face of the greenhouse, vegetable farmers can directly support the film to the pressure film steel wire on the front face of the greenhouse. By increasing the air vent, the amount of cold air entering the shed can be added, so as to accelerate the air activity and reduce the greenhouse temperature.
Because the temperature is not lower than 15 ℃. Therefore, as long as it is sunny and favorable terrain, vegetable farmers can open the upper and lower tuyeres of their products day and night, and then close the upper and lower tuyeres of the greenhouse when the temperature is low at night or when it rains
As for the greenhouse with 60 mesh insect proof net, vegetable farmers need not set up wind screen. When vegetable farmers set up windscreens in the early years, they were all to prevent the cool wind outside the greenhouse from blowing into the greenhouse and prevent the tomato fruits cultured in the greenhouse from chapping.
Now the use of high-density insect nets, insect nets will form a certain barrier to the cold air outside the shed, slow down the speed of cold air into the greenhouse, so that the cold air in the process of entering the greenhouse is preheated, the same can prevent cold air from chapping the skin of tomatoes.
In the greenhouse with high density insect proof net, the wind screen 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 wind shield inside the shed.