The film replacement is too early
In recent days, many vegetable farmers are busy changing the shed film, and some vegetable farmers even replaced the new shed film in August.
If the shed film is replaced at this time or earlier, the light intensity at noon is strong, and the new shed film has a high light transmittance, which will increase the temperature in the shed, adversely affect the growth of vegetables, cause diseases such as virus diseases, and the management is difficult. In addition, if the film is replaced prematurely, the glare will shorten the service life of the new film. If the shed film is changed from August to September, the new shed film will experience four or five months of wind and wind and rain, and a large amount of dust will accumulate on the shed film during the period from August to September. As a result, the fog will disappear, the dripping ability will deteriorate, and the light transmittance will decrease. With the addition of a low-temperature, low-light season, the illumination is weak, the illumination time is short, the temperature is low, and it is more difficult to achieve the light and temperature conditions required for the growth of the vegetables.
In addition, the shelf life of the shed film without dripping and annihilation is generally 4 to 6 months. The quality of the shed film with no dripping and annihilation properties is best reflected in the coldest December and the following January and February. If the replacement film is too early, the quality of the film will easily exceed the shelf life. According to professionals, changing the duration of the film is better when the night temperature is 10°C~14°C. Replacement of the damaged film is too early to guarantee normal growth of vegetables in the greenhouse. Henan Science and Technology News
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