The cultivation of shed vegetables is only based on their own cultivation of different vegetables and shed structure, and scientific selection of shed film can achieve high yield and high efficiency. At present, the market sales of the film is generally divided into four categories: no drip film, drip film, composite film and purple film, now their respective advantages and disadvantages are introduced as follows to facilitate the majority of farmers choose the right film.
After the dripless film (PVC film) is covered, the water droplets collected on the inner surface of the film can flow along the inclined surface to the front corner of the shed. There is no water drop on the film and the light transmission is good. The temperature in the shed is 4°C-5°C higher than that on the drip film. It is conducive to the growth of sheds in the cold season. There is no water drop under the membrane, and the humidity in the greenhouse is small, which greatly reduces the occurrence of various diseases. High temperatures in the shed, good light, and light disease are important conditions for the high yield and efficiency of sheds. No drop-film aging resistance, generally available for more than 2 years. But no drip film than the major, film thickness of 10 to 12 microns, covering 100 meters long film weighing about 125 to 130 kilograms, the price is higher than the drop film 20% to 30%. The film width is generally 3 to 4 meters, and it needs to be bonded when used.
A drip film (polyethylene film) covers a large number of water droplets on the inner surface of the film, which seriously affects the light transmittance. The temperature in the shed is low and the light is weak. Water droplets can drip on the ground at any time. The humidity in the greenhouse is heavy and the disease is heavy. It is not conducive to the growth of vegetables in winter, and the fruit and vegetable vegetables have poor yield and low efficiency. Drop film width 8 to 10 meters, covered without bonding. The proportion of small, film thickness of 7 to 8 microns, covering 100 meters long shed only 70 to 80 kg of film weight, cheaper prices. It is suitable for the production of leafy vegetables and cold sheds that are resistant to low temperature and low light such as leeks and celery.
The composite membrane combines three major advantages of dust resistance, aging resistance, and no drip. The specific gravity, thickness, and price are close to that of a non-drip film, which is an ideal film for use in vegetable greenhouses in winter and spring. However, when using it, you must face it up to receive good results. The violet film absorbs and reflects violet light. Purple light can control the length of vegetables and leaves, cover the purple film, make the shed reduce the purple, can promote the lush foliage, so that the main stem and leaf vegetables such as leek, celery, cabbage, lettuce, rape, spinach, garland chrysanthemum , parsley, shallots, garlic sprouts, etc., can not only increase production, but also improve quality, with high yield and high efficiency.
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