Order:
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Name |
Description |
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Alfisols that have, in one or more horizons within 50 cm of the mineral soil surface, aquic conditions (other than anthraquic conditions) for some time in normal years (or artificial drainage) and have one or both of the following:
- Redoximorphic features in all layers between either the lower boundary of an Ap horizon or a depth of 25 cm below the mineral soil surface, whichever is deeper, and a depth of 40 cm; and one of the following within the upper 12.5 cm of the argillic, natric, glossic, or kandic horizon:
- 50 percent or more redox depletions with chroma of 2 or less on faces of peds and redox concentrations within peds; or
- Redox concentrations and 50 percent or more redox depletions with chroma of 2 or less in the matrix; or
- 50 percent or more redox depletions with chroma of 1 or less on faces of peds or in the matrix, or both; or
- In the horizons that have aquic conditions, enough active ferrous iron to give a positive reaction to alpha,alpha-dipyridyl at a time when the soil is not being irrigated.
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Other Alfisols that have a cryic or isofrigid temperature regime. |
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Other Alfisols that have an ustic moisture regime. |
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Other Alfisols that have a xeric moisture regime. |
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Other Alfisols. |
Source:
Keys to Soil Taxonomy, Eighth Edition. 1998.
Links:
> > Suborders
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