Hapludalf
A soil profile of a Hapludalf. Note the light-colored E horizon that extends to a depth of about 10 inches. Clay content of the argillic horizon decreases noticeably below a depth of about 1 meter. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
Hapludalfs have an argillic (clay accumulation) subsoil horizon that typically extends to a depth of less than 150 cm. In many areas, the argillic horizon is at a depth of less than 100 cm. Where undisturbed, these soils generally have a thin, very dark brown A horizon that is 5 to 10 cm thick, over a lighter-colored brownish eluvial horizon. The eluvial horizon grades into a finer textured argillic horizon, generally at a depth of about 30 to 45 cm in loamy materials. Because these soils have been cultivated extensively, many of those on slopes have lost their eluvial horizons through erosion.
Hapludalfs formed principally in late-Pleistocene deposits or on a surface of comparable age. Temperature regimes are mesic or thermic. Hapludalfs are extensive in the northeastern States, excluding New England, and in Europe, excluding most of Scandinavia. In the United States, the vegetation was deciduous broadleaf forest but these soils are now mostly farmed.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...
Hapludalf
A soil profile of a Hapludalf. Note the light-colored E horizon that extends to a depth of about 10 inches. Clay content of the argillic horizon decreases noticeably below a depth of about 1 meter. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
Hapludalfs have an argillic (clay accumulation) subsoil horizon that typically extends to a depth of less than 150 cm. In many areas, the argillic horizon is at a depth of less than 100 cm. Where undisturbed, these soils generally have a thin, very dark brown A horizon that is 5 to 10 cm thick, over a lighter-colored brownish eluvial horizon. The eluvial horizon grades into a finer textured argillic horizon, generally at a depth of about 30 to 45 cm in loamy materials. Because these soils have been cultivated extensively, many of those on slopes have lost their eluvial horizons through erosion.
Hapludalfs formed principally in late-Pleistocene deposits or on a surface of comparable age. Temperature regimes are mesic or thermic. Hapludalfs are extensive in the northeastern States, excluding New England, and in Europe, excluding most of Scandinavia. In the United States, the vegetation was deciduous broadleaf forest but these soils are now mostly farmed.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...