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Vis-NIR spectrometry, soil phosphate extraction methods and interactions of soil attributes

Authors
  • De Oliveira, J.F.
  • Brossard, Michel
  • Corazza, E.J.
  • Marchão, R.L.
  • Siqueira Vendrame, P.R.
  • Rodrigues Brito, O.
  • Guimarães, M. de F.
Publication Date
Jan 01, 2015
Source
Horizon / Pleins textes
Keywords
Language
English
License
Unknown
External links

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 2200-2300nm. 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.

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