Título:	Vis-NIR spectrometry, soil phosphate extraction methods and interactions of soil attributes.
Autoria:	OLIVEIRA, J. F. de BROSSARD, M. CORAZZA, E. J. MARCHAO, R. L. VENDRAME, P. R. S. BRITO, O. R. GUIMARAES, M. de F.
Afiliação:	JOSÉ FRANCIRLEI DE OLIVEIRA, UNIVERSIDADE ESTADUAL DE LONDRINA MICHEL BROSSARD, UNIVERSIDADE ESTADUAL DE LONDRINA EDEMAR JOAQUIM CORAZZA, SCT ROBELIO LEANDRO MARCHAO, CPAC PEDRO RODOLFO SIQUEIRA VENDRAME, UNIVERSIDADE ESTADUAL DE LONDRINA OSMAR RODRIGUES BRITO, UNIVERSIDADE ESTADUAL DE LONDRINA MARIA DE FÁTIMA GUIMARÃES, UNIVERSIDADE ESTADUAL DE LONDRINA.
Ano de publicação:	2015
Referência:	Química Nova, São Paulo, v. 38, n. 3, p. 342-350, Mar. 2015
Conteúdo:	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
Palavras-chave:	Espectroscopia VIS/NIR Espectroscopia na região do visível (VIS) Espectroscopia do infravermelho próximo (NIR)
ISSN:	0100-4042
Digital Object Identifier:	https://doi.org/10.5935/0100-4042.20150009
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPAC)