Title:	Vis-NIR spectrometry, soil phosphate extraction methods and interactions of soil attributes.
Authors:	OLIVEIRA, J. F. de BROSSARD, M. CORAZZA, E. J. MARCHAO, R. L. VENDRAME, P. R. S. BRITO, O. R. GUIMARAES, M. de F.
Affiliation:	JOSÉ FRANCIRLEI DE OLIVEIRA, UEL; MICHEL BROSSARD, UEL; EDEMAR JOAQUIM CORAZZA, SCT; ROBELIO LEANDRO MARCHAO, CPAC; PEDRO RODOLFO SIQUEIRA VENDRAME, UEL; OSMAR RODRIGUES BRITO, UEL; MARIA DE FÁTIMA GUIMARÃES, UEL.
Date Issued:	2015
Citation:	Química Nova, São Paulo, v. 38, n. 3, p. 342-350, Mar. 2015
Description:	Abstract: 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 P-M and P-rem 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 P-M and P-rem 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 2200-2300 nm. However, the regression models generated were not suitable for quantitative phosphate analysis. Solubilization of organic matter and reactions during the P-M extraction process hindered correlations between the spectra and these P soil fractions. For P-rem,, the presence of Ca in the extractant and preferential adsorption by gibbsite and iron oxides, particularly goethite, obscured correlations with the spectra.
Thesagro:	Fosfato Extração Latossolo Análise do solo Espectrometria
NAL Thesaurus:	Phosphates Extraction Oxisols Soil analysis Spectroscopy
Keywords:	Espectroscopia VIS/NIR Espectroscopia na região do visível (VIS) Espectroscopia do infravermelho próximo (NIR)
ISSN:	0100-4042
DOI:	http://dx.doi.org/10.5935/0100-4042.20150009
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPAC)