With the extensive use of agricultural films, more and more species, but the role is different, and each has its own advantages, so it is necessary to make reasonable choices according to the type of crop and the purpose of use. 1, black agricultural film. Low light transmittance, only 10% or less, covered in many areas of grass, can make the weeds not germinate and die after death due to the necessary sunlight. The effect of stippling is stable and reliable, and labor is saved; the black film is slowly warmed, and the water retention performance is low. Well, in the high temperature season cover the cool and cool vegetables, the heat transfer is small, the water evaporation is small, so as to promote growth, if use the shade net, 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. 2, green agricultural film. With the green film, the green light increases and the visible light decreases, thus reducing the photosynthesis of the weeds under the mulching film and inhibiting the growth, thereby playing a role in herbicide; the green film has less moisturizing effect on the soil than the transparent film, but is stronger than black The membrane is beneficial to the growth of the aerial parts of the crop, and the yield increase effect is significant. Mostly used in strawberries, melons, tomatoes, eggplants, peppers and other vegetables, generally can make tomato and eggplant increased by 22% and 49%, respectively, but also makes eggplant shiny, coloring. 3, red agricultural film. Red ray, which can transmit red light, can prevent the growth of other unfavorable crops, so as to meet the demand of red light for crops. For rice seedlings, seedlings Miao Wang; covered beets, sugary and more; cultivation of carrots, roots become thick; planted leeks, the leaves are thick, early harvest, high yield. 4, blue agricultural film. In low-light conditions, the transmittance is higher than that of the transparent film, and in the case of strong light, it is lower than that of the transparent film, so the heat preservation performance is good, and the temperature rise is fast. The temperature in the film is generally higher than that of the transparent film by 2° C.-3° C. Therefore, the film is mainly used for rice breeding, which is conducive to cultivating short-sturdy seedlings. Can also be used for vegetables, strawberries, peanuts and other crops. At the same time, it has a good inhibitory effect on Alternaria sclerotiorum. 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, yellow agricultural film. Covering the yellow film, it can increase yellow light, and 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 1 time; covering celery can make the plant taller and extend the period of consumption. 7, silver gray film. It has the function of reflecting ultraviolet rays, repelling maggots and whitefly, and reducing crop virus diseases. It also has repellent effects on yellow striped hop, yellow snapping melon and weevil; it also inhibits weed growth and has good water retention effect. It is suitable for heat-resistant cultivation in spring or summer and autumn, such as eggplant, melon vegetables and tobacco. 8, silver reflective film. With reflective, thermal insulation and lower ground temperature effect. It can be used as a side wall of greenhouses and greenhouses, and utilizes reflected light to 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. 9, 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. It can be used in combination with shading nets and small arches to prevent insects, rain, wind and shade. 10, silver and black double-sided film. It has the multiple functions of reflecting light, avoiding eclampsia, eliminating grass and moisturizing, and the suitable crop is the same as black and white double-sided film.
Vitamin D series
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