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Iron oxide distribution and color studies of well-drained Alfisols developed on calcareous alluvial deposits in Greece

Six well-drained Alfisols pedons, three from Eastern Greece (Thessaly) and three from Western Greece (Agrinio), were studied focusing on iron oxides distribution and color characteristics. The primary assumption was not confirmed that rainfall was the main factor controlling their color and pedogenetic characteristics. Additionally, pedogenetic indices could not be used to distinguish the soils of Thessaly and Agrinio area. Results indicated a significant correlation between Munsell value (lightness) and chroma (purity of color) with amorphous oxides. An isomorphous replacement of Fe for Al is considered as probable. Second derivative spectroscopy indicated that goethite was probably the prevalent iron oxide.