How to change the greenhouse film in greenhouse cultivation? What is the use of old shed film?

There are more and more farmers planting greenhouse vegetables, and for them, the most important thing is to replace the film. Generally, greenhouse cultivation must be replaced once every 2-3 years, which not only improves the light transmission of the greenhouse, but also increases the insulation of the greenhouse. So what kind of shed film? How to replace it? Is there any use for the old shed film?

First, the common type of greenhouse film

There are three types of greenhouse film commonly used in greenhouse vegetable production: polyvinyl chloride (PVC) film, polyethylene (EVA) blown film, and polyethylene (PE) film.

1. EVA film: It is the most used shed film. It is about 2 yuan per square meter after 9 wires. It has good heat preservation performance and is suitable for solanaceous vegetables and melon vegetables.

2, PVC film: not resistant to aging, poor dust resistance, about 7 yuan per catty, the application is relatively wide.

3, PE film: poor insulation, the price is cheap, generally used to cover the arch shed, planting spring in advance or autumn after the gargle.

Second, the replacement method of the shed film

1. Change the film time: Generally, the film is changed before the vegetable is planted. In March, almost the arch shed is changed, and then the spring can be planted in advance. The greenhouse is generally selected after the suffocating shed in July and August. Choose to change the film when the weather is fine and windless. Generally speaking, the morning wind is small, and it is best to finish it in the morning.

2. Prepare the materials and tools needed to change the greenhouse film: greenhouse film, small greenhouse film, insect net, circlip, card slot, film line, pliers, scissors, etc.

3, remove the old shed film, check the skeleton for damage and wrap it with a soft cloth, a layer of diaper in the front section of the steel pipe, so as to avoid the shed film being puncture and hole. In addition, the plastic hose is placed on the section where the laminating rope is in contact with the shed film, so as to avoid the long time, the laminating rope will break the shed film.

4. Covering the new shed film: The small arch shed needs at least 4-6 people to change the film. If it is a large solar greenhouse, more people are needed. First, fix the insect nets of the upper air outlet and the small air outlet, then cover the greenhouse film and small. The shed film, confirm the front and back of the film before the film is covered, fix it with a circlip, go to the other side, evenly separate the personnel, tighten the shed film and fix it, attach the circlip on the card, tie the film line, and then complete It is. The shed film is tightened to reduce the damage of the agricultural film caused by the squashing of the agricultural film during the spring and autumn.

Third, the use of old film

The old shed film that you have replaced must not be thrown away. If it is not particularly damaged, it can be reused.

1. In winter, as a two-layer film covering cotton quilt, although some quilts are waterproof, most farmers use ordinary felt quilts. This quilt is most afraid of rain and snow, so after covering the quilt in winter, Covering the old shed film on the quilt not only protects against rain, but also increases the temperature inside the shed by 2-4 °C.

2, can be covered in the back wall of the shed to prevent rain and rain, especially some earthen walls sheds, the back wall must cover the shed film. After the wall is covered with waste film, the grass does not grow grass, reducing the rain and snow on the wall, prolonging the life of the wall, and increasing the temperature inside the shed.

The above is the specific matter of planting and replacing the shed film in the greenhouse. In fact, it is not particularly difficult to replace the shed film. The farmers can master the above skills. For the crop yield and quality, this aspect should also be taken care of.

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