Ramaroson V. H. auteur aut IRD Becquer Thierry auteur aut IRD Sa S. O. auteur aut IRD Razafimahatratra H. auteur aut IRD Delariviere J. L. auteur aut IRD Blavet Didier auteur aut IRD Vendrame P. R. S. auteur aut IRD Rabeharisoa L. auteur aut IRD Rakotondrazafy A. F. M. auteur aut IRD text journalArticle eng text/pdf born digital access The applicability of near-infrared reflectance spectroscopy (NIRS) as tool for estimating mineral soil constituents was assessed over a wide range of highly weathered soils in Madagascar. The predictions were based on two types of methods, chemometric methods using multivariate calibration models from partial least squares (PIS) regressions, and the use of spectral signatures of specific minerals. The predictions of mineralogical properties of soils using chemometric methods were poor, except for the quantification of iron oxides extracted with citrate bicarbonate dithionite (CBD) (R-cv(2) = 0.80). Soil minerals (kaolinite, gibbsite, goethite and hematite) were also estimated by NIBS but with less accuracy (R-cv(2), = 0.50-0.80). The predictions of kaolinite and gibbsite contents were improved by the use of the peak intensity of the first derivative spectra, situated at around 2205 nm for kaolinite and 2265 nm for gibbsite. The results indicate that NIRS can be used as a rapid analytical technique to simultaneously estimate the main minerals of highly weathered ferralitic soils with acceptable accuracy. specialized Diffuse reflectance spectroscopy Chemometrics Diagnostic absorption peak Soil mineral composition Highly weathered tropical soils MADAGASCAR ZONE TROPICALE 068 168 SI 102-109 2018 0341-8162 https://www.documentation.ird.fr/hor/fdi:010073186 10.1016/j.catena.2017.07.016 0341-8162 [F B010073186] https://www.documentation.ird.fr/hor/fdi:010073186 https://www.documentation.ird.fr/intranet/publi/2018/07/010073186.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2018-09-03 2023-07-11 fdi:010073186 fre