What is the function of black-and-white film? Main functions and uses explained
Black-and-white film has a warmth-preserving effect in winter. Its uses in our country are very widespread, including edible mushroom greenhouses, livestock and poultry breeding sheds, silkworm sheds, vegetable greenhouses, etc.
Other greenhouse films:
1. Blue agricultural film
This color of greenhouse film has good insulation performance; its light transmittance is higher than ordinary film under weak light conditions and lower than ordinary film under strong light conditions. It is suitable for covering rice seedlings, which can increase tillering, make the seedlings grow short and sturdy, and significantly improve both the seedling survival rate and seedling quality. When used to cover crops such as vegetables, cotton, peanuts, potatoes, and strawberries, it also has obvious yield-increasing and quality-improving effects.
2. Yellow agricultural film
Yellow film has an obvious yield-increasing effect on cucumbers, while blue film, although it can increase the vitamin C content, reduces cucumber yield.
3. Synthetic resin glass fiber reinforced board
Synthetic resin glass fiber reinforced board is a type of rigid plastic developed in recent years, also called tempered glass. It is a reinforced transparent board made from synthetic resin and glass fiber through mixing, laminating, and pressing. It solves the shortcomings of soft plastic film, which ages easily and breaks easily, and can be used as a transparent covering for permanent greenhouses and conservatories.
3. Ethylene-vinyl acetate film (EVA)
This agricultural film is a copolymerized ester film made by combining ethylene and vinyl acetate. Its advantages are that it is tough in texture, strong in both tensile strength and elongation, and can be used continuously for more than 15 months. Its surface has weak dust-attracting power, is not easily polluted, has relatively high light transmittance, is non-toxic and odorless, is relatively resistant to low temperatures, and does not harden easily, making it most suitable for use in severe cold winter regions.
At present, there are many types of agricultural film on the market. When choosing, everyone should make a selection based on the characteristics of the crops, the latitude and longitude of the region, and the intensity of sunlight, so as to help crops achieve high yields to the greatest extent.