Vis-NIR spectrometry, soil phosphate extraction methods and interactions of soil attributes De Oliveira, J.F. /Brossard, Michel Corazza, E.J. Marchão, R.L. Siqueira Vendrame, P.R. Rodrigues Brito, O. Guimarães, M. de F. SOL PHOSPHORE METHODE D'ANALYSE SPECTROMETRIE INFRAROUGE EXTRACTION ETUDE COMPARATIVE CALIBRAGE MODELISATION HAUTE ALTITUDE The objective of this study was to evaluate the relationships between the spectra in the Vis-NIR range and the soil P concentrations obtained from the Pm and Prem extraction methods as well as the effects of these relationships on the construction of models predicting P concentration in Oxisols. Soil samples’ spectra and their Pm and Prem extraction solutions were determined for the Vis-NIR region between 400 and 2500 nm. Mineralogy and/or organic matter content act as primary attributes allowing correlation of these soil phosphorus fractions with the spectra, mainly at wavelengths between 450-550, 900-1100 nm, near 1400 nm and between 2200-2300nm. However, the regression models generated were not suitable for quantitative phosphate analysis. Solubilization of organic matter and reactions during the PM extraction process hindered correlations between the spectra and these P soil fractions. For Prem,, the presence of Ca in the extractant and preferential adsorption by gibbsite and iron oxides, particularly goethite, obscured correlations with the spectra. 2015 text https://www.documentation.ird.fr/hor/fdi:010063759 fdi:010063759 De Oliveira J.F., Brossard Michel, Corazza E.J., Marchão R.L., Siqueira Vendrame P.R., Rodrigues Brito O., Guimarães M. de F.. Vis-NIR spectrometry, soil phosphate extraction methods and interactions of soil attributes. 2015, 38 (3), 342-350 EN BRESIL GOIAS