1. 
   Alfisols
   An order of soils with a medium-to-high base supply, horizons of clay accumulation, and gray-brown surface horizons.
   Found op http://cdiac.ornl.gov/glossary.html
   
   
2. 
   alfisols
   <ecology> Soils having significantly more clay in the B-horizon than in the A-horizon and high base status. ... (09 Oct 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?alfisols
   
   
3. 
   Alfisols
   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 ...
   Found op http://en.wikipedia.org/wiki/Alfisols
   
   
4. 
   Alfisols
   Soil order (type) of the United States Natural Resources Conservation Service Soil Classification System. Soil associated with forest vegetation. Upper layers of this soil are relatively rich in organic matter. Whitish layer found in the A horizon because of eluviation. Illuvial layer forms in the B...
   Found op http://www.physicalgeography.net/physgeoglos/a.html
   
   

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