A Preliminary Proposal for Reclassification of Andepts and some Andic Subgroups

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Date
1975
Authors
Smith, G.D
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Abstract
The classification of Andepts presented in Soil Taxonomy has a number of serious defects. First, the definition of the suborder clearly excludes a number of soils that should be included if we consider all of their properties. They were required to have their exchange complex dominated by amorphous materials throughout the upper 35 cm and to have low bulk densities, or to have more than 60 percent vitreous ash, etc. Nany Andepts have a surface horizon of 15 to 25 ~~ thickness that does not react to NaF as is required I by the definition of domination by amorphous materials. The 60 percent limit of vitreous materials has been interpreted by some to mean that any soil formed in ash and having less than 40 percent clay must be classified as an Andept unless it has a diagnostic horizon prohibited in Inceptisols.
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