EAA.Acraquox

Key to Great Groups 

EAA. Aquox that have, in one or more subhorizons of an oxic or kandic horizon within 150 cm of the mineral soil surface, an apparent ECEC of less than 1.50 cmol(+) per kg clay and a pH value (in 1N KCl) of 5.0 or more. Acraquox, p. 659 

EAA. This great group is provided for those Aquox with extremely low cation-exchange capacities. Few examples have been made available for study. 

Definition 

Acraquox are the Aquox that have an apparent ECEC of less than 1.50 cmol(+) per kg clay and a pH value (1N KCl) of 5.0 or more in some part of an oxic or kandic horizon within 150 cm of the mineral soil surface. 

Key to Subgroups 

EAAA. Acraquox that have 5 percent or more (by volume) plinthite in one or more horizons within 125 cm of the mineral soil surface. Plinthic Acraquox 

EAAB. Other Acraquox that have, directly below an epipedon, a horizon 10 cm or more thick that has 50 percent or more chroma of 3 or more. Aeric Acraquox 

EAAC. Other Acraquox. Typic Acraquox 

Definition of Typic Acraquox 

Typic Acraquox are the Acraquox that:

1. Do not have, within 125 cm of the mineral soil surface, a horizon that has more than 5 percent plinthite (by volume); and

2. Do not have, directly below an epipedon, a horizon 10 cm or more thick that has 50 percent or more chroma of 3 or more.

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