While the exact pH cutoffs vary with order, an acidic portion of the soil profile (and less often, an alkaline one) is a key definition of many groups and subgroups. This should probably be added to the list of Diagnostic Criteria along with brief information on appropriate measurement techniques. Specific pH cutoffs to use can be left in the key itself.
While the exact pH cutoffs vary with order, an acidic portion of the soil profile (and less often, an alkaline one) is a key definition of many groups and subgroups. This should probably be added to the list of Diagnostic Criteria along with brief information on appropriate measurement techniques. Specific pH cutoffs to use can be left in the key itself.