A planosol in the FAO World Reference Base for Soil Resources is a soil with a light-coloured, coarse-textured, surface horizon that shows signs of periodic water stagnation and abruptly overlies a dense, slowly permeable subsoil with significantly more clay than the surface horizon. In the US Soil Classification of 1938 used the name Planosols, w...
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http://en.wikipedia.org/wiki/Planosol
one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO). Planosols are characterized by a subsurface ... [1 related articles]
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http://www.britannica.com/eb/a-z/p/76
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