Haplargid AU
A soil profile of a Haplagrid in Australia. This soil has a relatively thin argillic horizon (darker colored area from depths of about 10 to 30 centimeters) in the upper part of the profile. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
Haplargids have only an argillic (clay accumulation) horizon. They commonly have some calcium carbonate accumulations within or below
the argillic horizon. Haplargids commonly occur on late-Pleistocene surfaces or sediments.
Argids are the Aridisols that have an argillic (clay accumulation) or natric (high levels of illuvial clay and sodium) horizon. In many Aridisols, the low water flux and high concentration of salts hinder clay illuviation. The presence of an argillic horizon is therefore commonly attributed to a moister paleoclimate (although there is evidence that clay illuviation occurred during the Holocene in arid soils). In semiarid areas (where the soil moisture regime grades to ustic or xeric), clay translocation commonly is more evident. Most Argids occur in North America. A few have been recognized in the deserts of North Africa and the Near East.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...
Haplargid AU
A soil profile of a Haplagrid in Australia. This soil has a relatively thin argillic horizon (darker colored area from depths of about 10 to 30 centimeters) in the upper part of the profile. (Soil Survey Staff. 2015. Illustrated guide to Soil Taxonomy. U.S. Department of Agriculture, Natural Resources Conservation Service, National Soil Survey Center, Lincoln, Nebraska)
Haplargids have only an argillic (clay accumulation) horizon. They commonly have some calcium carbonate accumulations within or below
the argillic horizon. Haplargids commonly occur on late-Pleistocene surfaces or sediments.
Argids are the Aridisols that have an argillic (clay accumulation) or natric (high levels of illuvial clay and sodium) horizon. In many Aridisols, the low water flux and high concentration of salts hinder clay illuviation. The presence of an argillic horizon is therefore commonly attributed to a moister paleoclimate (although there is evidence that clay illuviation occurred during the Holocene in arid soils). In semiarid areas (where the soil moisture regime grades to ustic or xeric), clay translocation commonly is more evident. Most Argids occur in North America. A few have been recognized in the deserts of North Africa and the Near East.
For additional information about soil classification, visit:
www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/cla...