Key to Subgroups
HCGO. Other Hapludults. Typic Hapludults
Description of Subgroups
HCGO. Typic Hapludults.—The central concept or Typic subgroup of Hapludults is fixed on freely drained soils that are moderately deep or deeper to hard rock, have an ochric epipedon that is not both thick and sandy (not sand or loamy sand), have a loamy or clayey particle-size class in the argillic horizon, but do not have deep cracks in normal years. Ground water at a moderate depth, redox depletions with low chroma at a shallow depth, and a fluctuating level of ground water in the iron-depleted zone are properties shared with Aquults and define the Oxyaquic and Aquic subgroups. A thick sandy layer, starting at the mineral soil surface, defines Arenic and Grossarenic subgroups. A shallow lithic contact defines the Lithic subgroup. A dark colored, relatively thick ochric epipedon or an umbric epipedon is considered abnormal and indicates an intergrade to Humults. A very thin argillic horizon also is considered abnormal and is used to define the Inceptic subgroup. A sandy particle-size class and lamellae in the argillic horizon indicate development that is weaker than normal and define the Psammentic and Lamellic subgroups. A clayey particle-size class, deep cracks, and a high COLE are properties shared with Vertisols and define the Vertic subgroup. Typic Hapludults are of very large extent in the Eastern and Southeastern United States. The natural vegetation consisted of forest plants. Slopes range from nearly level to steep. Where slopes are suitable, many of these soils are used as cropland. Many of the soils, particularly those that are steep, are used as forest. Some are used as pasture or homesites.
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