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Landscape position is a critical factor influencing many co‐varying soil properties even in highly weathered soils that tend to have a high degree of homogeneity. The objective of this study was to learn how the position of a soil in a toposequence influences soil color, mineralogy, and some chemical and physical properties.

In a toposequence of Oxisols developed from basalt in the Central Plateau of Brazil (Goias State), moist soil color changed from dark reddish brown (2.5YR 3/4) in upper slope positions to dark yellowish brown (10YR 4/4) in lower slope positions and the following trends were observed: hematite content decreased and goethite content increased, the amount of Al substitution in the goethite structure increased, gibbsite content decreased and kaolinite content increased, and magnetic suceptibility and maghemite content of fine clay decreased. Also, the yellower soils down slope adsorbed more P …