The production of shed vegetables can only be achieved according to the cultivation of different vegetables and greenhouse structures. At present, the shed films sold on the market are generally divided into four categories: no drip film, drip film, composite film and violet film. The advantages and disadvantages of each are described below to facilitate the majority of vegetable farmers to choose a suitable film.
The droplets collected on the inner surface of the shed film covered by the drip-free film (polyvinyl chloride film) can flow to the front corner of the shed with a slanting surface. There is no water droplet on the film, and the light transmission is good. The temperature in the shed is 4 ° C ~ 5 ° C higher than the average drop film. Conducive to the growth of sheds in the cold season. There is no dripping under the membrane, and the humidity in the shed is small, which greatly reduces the occurrence of various diseases. The temperature inside the shed is high, the light is good, and the disease is light, which is an important condition for high yield and high efficiency of shed vegetables. No drip film is resistant to aging and generally can be used for more than 2 years. However, there is no dripping film ratio, the film thickness is 10 to 12 micrometers, and the greenhouse film covering 100 meters long weighs about 125-130 kilograms, and the price is 20% to 30% higher than that of the drip film. The film width is generally 3 to 4 meters, and it needs to be bonded when used.
After the drip film (polyethylene film) is covered, a large amount of water droplets will accumulate on the inner surface of the film, which seriously affects the light transmittance. The temperature inside the shed is low and the light is weak. The water droplets will drip off the ground at any time. The humidity in the shed is heavy and the disease is heavy, which is not conducive to the growth of winter vegetables. The yield of fruits and vegetables is low. There is a drop film width of 8 ~ 10 meters, covering without bonding. The specific gravity is small, the film thickness is 7-8 micrometers, and it is only 70-80 kilograms of the greenhouse film covering 100 meters long shed, and the price is cheap. It is suitable for the production of leafy vegetables and cold sheds with low temperature and low light, such as leeks and celery.
The composite membrane concentrates on the three major advantages of dustproof, aging resistant and no dripping. The specific gravity, thickness and price are close to no drip film, which is the ideal shed film for vegetable greenhouses in winter and spring. However, you must use the face up to get good results. The violet film absorbs and reflects violet light. Violet can control the stems and leaves of vegetables, and after the purple film is covered, the purple light in the shed can be reduced, which can promote the flourishing of branches and leaves. Thus, the vegetables mainly based on stems and leaves, such as leeks, celery, cabbage, lettuce, rape, spinach, and sage , coriander, shallots, garlic, etc., not only can increase the yield, but also improve the quality, with high yield and high efficiency.
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