Nano yellow tungsten oxide may be applied for producing heat insulation agricultural film so that such film may not only have excellent anti-ultraviolet effect, but also have high visible light transmittance. The ultraviolet blocking rate of the heat insulation film is up to 60% and the visible light transmittance is as high as 92% or more.
Since the yellow tungsten oxide nanoparticles also have a blocking ratio of 80% or more of the infrared rays at the wavelength of 780nm-2400nm, the agricultural film to which the yellow tungsten oxide nanoparticles are added can be used for covering the ground of the cultivated plants. Certainly, it can also be used as a greenhouse or shed film. It is worth to note that the temperature of the covered ground can be raised, the soil is warmed, but the temperature in the greenhouse does not rise, which is extremely beneficial to promote the growth of plants.
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