Insect net is a new type of agricultural covering material. It is made of high-quality polyethylene and added with anti-aging, anti ultraviolet and other chemical additives. It is like a window screen. It has the characteristics of tensile strength, heat resistance, water resistance, corrosion resistance, non-toxic and tasteless. It is easy to collect and has a proper storage life of about 3-5 years.
In addition to the advantages of sunscreen, the biggest feature of vegetable insect control net is that it can prevent insects and diseases, greatly reduce the use of pesticides. It is the key technology of pollution-free vegetables and a simple, scientific and effective insect control measure.
How to cool down
Open the upper and lower air outlets of the shed to the maximum. Now the straw curtain on the shed has been removed, and the air vent on the top of the shed can be opened to the maximum, that is, the air release film can directly support the south edge of the rear slope of the shed
After increasing the vent, the high temperature air in the shed can be discharged more quickly. For the vent on the front face of the shed, the vegetable farmer can directly support the film to the film pressing steel wire on the front face of the shed, and increase the amount of cold air entering the shed by increasing the vent, so as to accelerate the air flow and reduce the shed temperature.
For the greenhouse with 60 mesh insect control net, the vegetable farmers can no longer set up the wind screen.
When the vegetable farmers used to set up the windbreak film, they all tried to prevent the cold wind outside the shed from blowing into the shed, and to prevent the tomato fruits planted in the shed from chapping.
Now, after using the high-density insect screen, the insect screen will block the cold air outside the shed to a certain extent, slow down the speed of cold air entering the shed, make the cold air preheat in the process of entering the shed, and also avoid the cold air chapping the tomato skin.
In the greenhouse with high density insect net, the wind proof film will also affect the air circulation in the shed, and reduce the ventilation and cooling effect of the shed. Therefore, vegetable farmers should remove the windbreak from the shed. Because the current temperature is generally no less than 15 ℃.
As long as it is sunny, the vegetable farmers can open the upper and lower air outlets of the products day and night, and then close the upper and lower air outlets of the shed when the temperature is low or when it rains on a cloudy night.