| 摘要 |
A polymeric, multilayer, photoselective film for use in agriculture, comprising at least two layers, an upper layer facing the sky and a lower layer facing the ground. Each of the layers is of a different colour, and each is light-transmissive. The upper layer is of a colour which repels insects, and the lower layer is of a colour whereby the solar radiation transmitted by the film and reaching the ground is of such a spectral composition that will largely deprive weeds of photosynthetically active radiation, while having a spectral component that will be absorbed by, and will heat, the ground.
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