%0 Journal Article
%9 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES
%A De Oliveira, J.F.
%A Brossard, Michel
%A Corazza, E.J.
%A Marchão, R.L.
%A Siqueira Vendrame, P.R.
%A Rodrigues Brito, O.
%A Guimarães, M. de F.
%T Vis-NIR spectrometry, soil phosphate extraction methods and interactions of soil attributes
%D 2015
%L fdi:010063759
%G ENG
%J Quimica Nova
%@ 0100-4042
%K SOL ; PHOSPHORE ; METHODE D'ANALYSE ; SPECTROMETRIE INFRAROUGE ; EXTRACTION ; ETUDE COMPARATIVE ; CALIBRAGE ; MODELISATION ; HAUTE ALTITUDE
%K BRESIL ; GOIAS
%K PLANALTINA
%M ISI:000354781600009
%N 3
%P 342-350
%R 10.5935/0100-4042.20150009
%U https://www.documentation.ird.fr/hor/fdi:010063759
%> https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers15-04/010063759.pdf
%V 38
%W Horizon (IRD)
%X 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.
%$ 068ANASOL