Vegetable greenhouses can only really exert the "greenhouse" effect by covering the shed film. In actual production, many farmers have misunderstandings in the choice of shed film and the method of covering.

In general, the vegetable greenhouse film is divided into two parts, one for the roof shed film and the other for the wind shed film. The former is recommended to purchase polyvinyl chloride or ethylene-vinyl acetate high-temperature composite film with high light transmittance, no dripping and anti-fogging property, long life, and the latter is recommended to use polyethylene film. Many farmers can produce shed film of polyvinyl chloride as a vent film. Among them, the vegetable greenhouse of a vegetable farm is 100 meters long. Because of the large flexibility of the polyvinyl chloride film, he only used the film of 90 meters long and 2.2 meters wide. As a result, at the air outlet, the roof shed film overlaps with the air shed film by 30 cm to ensure the "closed wind" effect. However, for a long time, the stretchable PVC shed film "shrinks", which leads to the closing of the wind. Not strict. If it is winter night, the closed wind is not strict, it is easy to cause vegetable freezing damage. Therefore, do not use a PVC film as a vent film.

As for the laminating rope, its main function is to "press" the shed film instead of destroying the shed film. Many of the linings of the farmer's shed are pulled from top to bottom, rather than straight up and down. Due to the inclined pulling of the laminating rope, it straddles the arch of the big bamboo or steel pipe for a long time, and then pulls the grass raft, and the laminating rope rubs back and forth with the shed film, resulting in damage to the shed film. , seriously affecting the insulation effect of the shed film.

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