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The potential of using near-infrared reflectance spectroscopy (NIRS) to discriminate between seven broadleaf weed species, sunflower and wheat stubble was evaluated. Our results showed that the spectral window between 750 and 950 nm,which corresponds to near-infrared wavelength,was able to discriminate among wheat stubble,sunflower and the most problematic ‘‘hardto- control’’ weeds in no-till sunflower,i.e. Little mallow (Malva parviflora L.) and Ecballium elaterium L. These results are promising for further work in real-time remote sensing identification of weed patches in sunflower fields.
Ministerio de Ciencia y Tecnología projects (AGL 2002-04468-CO3-02 and AGL 2002-03801).