Order:
Suborder:
[ ]
| Code |
Name |
Description |
|
|
Argids that have a duripan or a petrocalcic or petrogypsic horizon that has its upper boundary within 150 cm of the soil surface. |
|
|
Other Argids that have a natric horizon. |
|
|
Other Argids that do not have a densic, lithic, or paralithic contact within 50 cm of the soil surface and have either:
- A clay increase of 15 percent or more (absolute) within a vertical distance of 2.5 cm either within the argillic horizon or at its upper boundary; or
- An argillic horizon that extends to 150 cm or more from the soil surface, that does not have a clay decrease with increasing depth of 20 percent or more (relative) from the maximum clay content, and that has, in 50 percent or more of the matrix in some part between 100 and 150 cm, either:
- Hue of 7.5YR or redder and chroma of 5 or more;
or
- Hue of 7.5YR or redder and value, moist, of 3 or less and value, dry, of 4 or less.
|
|
|
Other Argids that have a gypsic horizon that has its upper boundary within 150 cm of the soil surface. |
|
|
Other Argids that have a calcic horizon that has its upper boundary within 150 cm of the soil surface. |
|
|
Other Argids. |
Source:
Keys to Soil Taxonomy, Eighth Edition. 1998.
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