Key to Great Groups
JEB. Other Udalfs that have:
1. A glossic horizon; and
2. In the argillic or kandic horizon, discrete nodules, 2.5 to 30 cm in diameter, that:
a. Are enriched with iron and extremely weakly cemented to indurated; and
b. Have exteriors with either a redder hue or a higher chroma than the interiors. Ferrudalfs, p. 201
JEB. Ferrudalfs are the Udalfs that do not have a natric horizon and have both a glossic horizon and an argillic or kandic horizon that has been partially cemented by iron. In some areas these soils formed under a heath vegetation. The heath vegetation may have succeeded a forest following many years of collection and removal of forest litter. Under the heath, which is efficient in complexing iron and aluminum, the upper part of the argillic horizon was destroyed and fragments of the argillic horizon became coated and weakly cemented with iron. Some Ferrudalfs have a fragipan at some depth, commonly about 100 cm. Ferrudalfs are not known to occur in the United States and are rare elsewhere. Only two subgroups are provided.
Ferrudalfs are the Udalfs that:
1. Do not have a natric horizon;
2. Have a glossic horizon; and
3. In the argillic or kandic horizon, have discrete nodules, 2.5 to about 30 cm in diameter, that are enriched with iron, that are extremely weakly cemented to indurated, and that have exteriors with either a redder hue and/or a higher chroma than the interiors.
Key to Subgroups
JEBA. Ferrudalfs that have, in one or more horizons within 60 cm of the mineral soil surface, redox depletions with chroma of 2 or less and also aquic conditions for some time in normal years (or artificial drainage). Aquic Ferrudalfs
JEBB. Other Ferrudalfs. Typic Ferrudalfs
Definition of Typic Ferrudalfs
Typic Ferrudalfs are the Ferrudalfs that do not have, in one or more horizons within 60 cm of the mineral soil surface, redox depletions with chroma of 2 or less and also aquic conditions for some time in normal years.
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