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VIS-NIR SPECTROMETRY, SOIL PHOSPHATE EXTRACTION METHODS AND INTERACTIONS OF SOIL ATTRIBUTES

Authors :
José Francirlei de Oliveira
Michel Brossard
Edemar Joaquim Corazza
Robélio Leandro Marchão
Pedro Rodolfo Siqueira Vendrame
Osmar Rodrigues Brito
Maria de Fátima Guimarães
Source :
Química Nova, Vol 38, Iss 3, Pp 342-350 (2015)
Publication Year :
2015
Publisher :
Sociedade Brasileira de Química, 2015.

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 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 2200-2300 nm. 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.

Details

Language :
English, Spanish; Castilian, Portuguese
ISSN :
16787064 and 01004042
Volume :
38
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Química Nova
Publication Type :
Academic Journal
Accession number :
edsdoj.9b82fa13ab4440ca8ee8d9b6b4b7c2ad
Document Type :
article
Full Text :
https://doi.org/10.5935/0100-4042.20150009