Alfisols are a soil order in USDA soil taxonomy. Alfisols form in semiarid to humid areas, typically under a hardwood forest cover. They have a clay-enriched subsoil and relatively high native fertility. `Alf` refers to aluminium (Al) and iron (Fe). Because of their productivity and abundance, the Alfisols represent one of the more important soi.....
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http://en.wikipedia.org/wiki/Alfisol
one of the 12 soil orders in the U.S. Soil Taxonomy. Alfisols are arable soils with water content adequate for at least three consecutive months of ... [1 related articles]
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http://www.britannica.com/eb/a-z/a/44
a fertile soil of humid regions that occurs worldwide, esp. where native broadleaf forests were established, and is highly productive for agriculture.
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https://www.infoplease.com/dictionary/alfisol
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