Properties of the hottest color films

2022-07-24
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In recent years, vegetable production in plastic film greenhouses has developed rapidly all over the country. A variety of new color films came into being. Due to the different colors of the color film, the absorption and reflection laws of the spectrum are also different. When sunlight with different wavelengths shines on crops, it has different effects on the growth of crops, weeds, pests and diseases, and ground temperature. Therefore, it is necessary to select and use color films of appropriate colors according to different requirements in vegetable production. Good results can be achieved. This paper briefly introduces the properties of some color films. 

1. Parker company said that it has developed a "unique and innovative" technology red film

the red light transmittance of the film can reach 75% ~ 90%, which can block the transmission of color light that is not conducive to the growth and development of crops. It can be used to meet the needs of some crops for red light to the greatest extent and promote the growth of crops. For example, sugar content of sugar beet increases; The taproot of carrot grows bigger; Leek has wide leaves and thick flesh, early harvest and high yield. 

2. Yellow film

according to the experiment, covering cucumber with yellow film can promote budding and flowering, and increase the yield by 0.5 ~ 1 times; Covering celery and lettuce can make plants grow tall and delay mossing; Covering dwarf lentils can make plant internodes grow and beans grow strong. 

3. Green film

the main feature of this film is that the transmittance of visible light (orange red) for photosynthesis of plants is reduced. The warming effect is between the ordinary film and the black film. It is mainly used in strawberries, beans, eggplant, sweet pepper, tomatoes, melons and other vegetables and other economic crops

4. Blue film

this film is mainly characterized by good heat preservation performance. It can be used to cover vegetables, peanuts, strawberries and other crops. In early spring, the light blue plastic film can penetrate a large amount of blue and purple light to make the seedlings short and strong; At the same time, it can also absorb a lot of orange light and improve the temperature in the shed. 

5. Purple film

this film is characterized by increasing the transmittance of purple light. It is mainly applicable to the cultivation of eggplant fruits and green leafy vegetables in greenhouses or plastic greenhouses in winter and spring. It can improve quality, increase yield and economic benefits. 

6. Black film

the film is mainly characterized by low light transmittance, which can effectively prevent adjustable reporting situations and weed. When the ground is covered, the visible light transmittance can be kept below 10%, so that the weed buds can not get the necessary sunlight and die. In addition, the covered ground is not easy to transfer heat, which can effectively prevent the evaporation of soil moisture. Covering cucumber seedlings with black film could promote early flowering; Summer radish, Chinese cabbage, spinach, Autumn Cucumber and late tomato are well cultivated in high temperature season. 

7. Silver grey film

the film has a strong ability to reflect ultraviolet light, which can effectively repel aphids and whitefly, and inhibit the occurrence of viral diseases. In addition, silver gray film has weeding effect, and its warming effect is between transparent film and black film. It is mainly applicable to the cultivation of vegetables and melons in summer and autumn. It has a good role in disease prevention, aphid control and quality improvement. 

8. Silver reflective film

this film is also called specular reflective film or specular reflective film. It is mainly applicable to the cultivation of greenhouse vegetables. It can be hung on the north side of the cultivation border in the greenhouse to change the lighting conditions in the greenhouse, so as to improve crop yield and quality. However, the silver reflective film is unfavorable to the heat storage in the greenhouse at night. 

9. Black and white double-sided film

the film is composed of black and white films, which have been used to test some building blocks with a kind of impact modified polylactic acid. It is mainly suitable for heat resistant cultivation of vegetables and melons in summer and autumn. When covered, it is milky white and upward, with reflective effect; The black color is downward, which has a good effect on reducing ground temperature, and has a good effect on water conservation and weeding. After the ground is covered, warm vegetables such as cucumber, tomato, eggplant, pepper and kidney bean and cool vegetables such as radish, cabbage and lettuce can be well produced in summer, and the yield is hardly affected

10. Silver Black double-sided film

the film is composed of silver gray and black film. When covered, the silver gray film is upward and the black film is downward, which has the functions of avoiding aphids, weeding and water conservation. It is mainly used for heat and disease resistance cultivation of vegetables and melons in summer and autumn. To sum up, the color film is used to scientifically control the sunlight of specific wave bands, give special illumination to crops, stimulate the internal tissues of plants, so as to speed up the growth of plants and change the nutritional components of more beautiful plants. Or adjust and control the environment to avoid the occurrence of weeds, diseases and pests, so as to achieve the effect of increasing production and income

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