HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.Improving the quantification of sediment source contributions using different mathematical models and spectral preprocessing techniques for individual or combined spectra of ultraviolet-visible, near-and middle-infrared spectroscopy

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Seed inoculation with Azospirillum brasilense might be an interesting alternative to reduce the nitrogen demand applied to plants and to enhance the effect of these fertilizers. This study aimed to evaluate the components of maize crops and its response to inoculation with A. brasilense associated with sowing and top cover nitrogen fertilization. A completely randomized block experimental design was used, and the tests were carried out in two crop years. The treatments in the first crop year were: BF + CF: {nitrogen base fertilization (BF) + cover fertilization (CF)}; BF + BI: {BF + A. brasilense bacterium inoculation (BI)}; BF + BI + CF; BI; BI + CF and NFI: {no fertilization or inoculation}. The same treatments were tested in the second crop year, and the CF was added. The tests were carried out in the field, in the municipality of Abelardo Luz -SC -Brazil. The climate is humid mesothermal with hot summers and cold winters (Cfa). The following parameters were evaluated: plant height, leaf and grain nitrogen, yield, thousand-grains weight, and grain moisture. The inoculation of A. brasilense associated with cover fertilization could be an alternative to reduce the demand for N, including an increase in productivity. The use of A. brasilense without N fertilization provided an increase in crop yield.

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