1. The time of high temperature shack should not be too long
"High temperature stuffy shed" has great damage to the shed membrane. It is understood that the long-term high-temperature shed in the greenhouse can reduce the service life of the shed film. If the shed film is over a month in the summer high temperature season, the shed film will be seriously aging: low light transmittance, poor thermal insulation and easy damage.
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Therefore, the temperature in summer is not too long, generally 15-20 days is appropriate. Don't replace the new film in the greenhouse before the stuffy shed. Replace the new membrane after the stuffy shed and before planting the next vegetable, so as to slow down the aging of the greenhouse film. The shed film has good light transmission and longevity during winter. .
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Second, prevent steel pipe hot film
At present, the main skeleton of the greenhouse is mostly replaced by a steel pipe. In the summer, the temperature of the steel pipe is very high under direct light, and it is easy to cause the shed film to be burnt due to the back plate effect.
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Therefore, the protective layer should be wrapped in advance on the frame of the greenhouse, especially on the steel tube. You can choose to wrap it with film or rags. One is to prevent the wire and burrs on the frame from scratching the film. The second is to prevent the high temperature of the steel tube in summer. Scalding, shorten the service life.
3. Less use of pesticide spraying or fumigation shed
Many pesticides will damage the shed membrane after being used in the shed, especially some insecticides and pesticides containing sulfur or chlorine will destroy the stability of the agricultural membrane. micro-
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When spraying, pay attention to not spraying pesticides on the agricultural film, and pay attention to reducing the use of sulfur preparations when fumigating, and arrange the time for fumigation reasonably. If sulfur fumigation greenhouse is used, it will have a great influence on the life of the greenhouse film, especially when fumigation is frequent, it will greatly accelerate the aging speed of the greenhouse film.
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4. Avoid contact between EVA shed film and PVC film
Most vegetable farmers will not remove the shed film on the two mountains when replacing the new film, which is unreasonable. If the polyvinyl chloride film is used in the greenhouse in the last season, and the EVA film is to be replaced in the next season, the aging of the EVA greenhouse film will be accelerated when the two kinds of greenhouse films are in contact, which is very harmful.