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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Pasture degradation is an evolutionary process of losing vigor, productivity and capacity of natural recovery of pastures. It can economically cripple the production and the forage quality required by the animals. This process can have a physical and/or chemical and/or biological origin. The aim of this study was to evaluate the effects of tillage, liming and fertilization on a yellow distrofic oxisol from a oastal land zone and its consequences on Brachiaria decumbens root system. The experiment was located at UFRB experimental area, Cruz das Almas – BA, Brazil. The experimental design was arranged in a split plot, with two tillage treatments: heavy disc harrowing (Gp) and heavy disc harrowing + subsoiling (Gp + Subs) in three blocks and five fertilizers combinations: control (Test.); liming (Cal); NPK; NPK + Cal; and Cal + Agricultural Gypsum + NPK (CalGA + NPK). Were evaluated: density, porosity and the mechanical resistance of soil to penetration, pH, Al3+ and V% values and also root density. It was observed that the effect of subsoiling on soil physical attributes lasted for two years, increasing soil porosity and decreasing soil density and resistance to root penetration. Subsoiling interacted with lime leading to a depth correction.

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