Oxisols (from the French oxide – oxide) are soils of tropical and subtropical regions, which are dominated by iron oxides, quartz, and highly weathered clay minerals such as kaolinite.
These soils are typically found on gently sloping land surfaces of great age that have been stable for a long time. For the most part, they are nearly featureless soils without clearly marked layers, or horizons.
Because they are highly weathered, they have low natural fertility, but can be made productive through wise use of fertilizers and lime.
Oxisols are found over about 8% of the glacier-free land surface.