Scientific use of colored agricultural film can achieve good results in increasing production and preventing diseases. The scientific use methods of various colored agricultural films are introduced as follows for reference of farmers: 1. Black and white double-sided film. Can enhance the reflection of light, can reduce the temperature, while maintaining good water and grass effect. It is mainly used for heat-resistant cultivation of vegetables and melons in summer and autumn, and chickens, ducks, geese and edible fungi in greenhouses. If combined with the shading net small shed, pest control, rain, wind, shading better. 2. Green agricultural film. The green film can reduce the visible light and increase the green light, so it can reduce the photosynthesis of weeds under the mulch, inhibit the growth, and thus play a role in weed control; the green film has less effect on the soil than the transparent film, but is stronger than the black film. It is beneficial to the growth of the aerial parts of crops and has a significant yield increase effect. Mostly used on strawberries, melons, tomatoes, eggplants, peppers and other vegetables. 3. Blue agricultural film. In low light conditions, the blue film transmittance is higher than the transparent film; under the strong light conditions, it is lower than the transparent film, so the blue film insulation performance is good, the temperature is also fast, the film temperature is generally higher than the transparent film 2 °C ~ 3°C. Therefore, the film is mainly used for rice breeding, which is conducive to cultivating short-sturdy seedlings. It can also be used to grow vegetables, strawberries, peanuts and other crops. The cruciferous vegetables have better inhibition of Alternaria. 4. Red agricultural film. It can transmit red light and prevent the light transmitted by other unfavorable crops from passing through to meet the red light requirements of crops. For rice seedlings, seedlings Miao Wang; covered beets, sugary and more; cultivation of carrots, roots become thicker; planted leeks, the leaves thick, listed early, high yield. 5. Purple agricultural film. The purple light transmittance can be increased, which is conducive to increase and accumulation of nutrients in crops, and can increase yield and improve quality. It is mainly used for the cultivation of solanaceous and green leafy vegetables in winter and spring or plastic greenhouses. 6. Silver gray agricultural film. It has the function of reflecting ultraviolet rays, repelling aphids and whitefly, and reducing crop virus diseases. It also has a repellent effect against yellow song strips, yellow snapping melons and weevil; it can also inhibit the growth of weeds and has a good water retention effect. It is suitable for heat-resistant cultivation in the spring or summer and autumn, such as eggplants, melons and vegetables. 7. Yellow agricultural film. Covering the yellow film can increase the yellow light, can pass red, yellow, and orange light, and can eliminate blue and purple light. Covering the cucumber can promote bud blossom and increase production by more than 30%. Covering celery can make the plant taller and extend the consumption period. 8. Black agricultural film. Low light transmittance, only less than 10%, covered in many areas of grass, can make the weeds germinate without the necessary sunlight and die, the effect of stippling is stable and reliable; the black film is slowly warming and has good water retention performance. Covering the cool and cool vegetables in the hot season, the heat transfer is small and the water evaporation is small, so as to promote growth. If the shade net is used, the cooling effect is more obvious. The suitable range is summer radish, Chinese cabbage, spinach, loquat, autumn cucumber, etc. Weeding perennial crops or orchards is also good. 9. Silver reflective film. With reflective, thermal insulation, and reduce the role of temperature. It can be used as a side wall of greenhouses and greenhouses. By using reflected light, it can increase the light intensity of the crops and between the rows of fruit trees and promote the coloration. It can also be used for the ground cover of greenhouse tomato, grape, cherry, apple cultivation.
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