By U. S. Department of Agriculture, Natural Resources Conservation Service, Soil Survey Staff
The booklet Keys to Soil Taxonomy serves reasons. It offers the taxonomic keys worthwhile for the category of soils in a sort that may be used simply within the box. It additionally acquaints clients of the taxonomic procedure with contemporary alterations within the method. The 11th variation of the Keys to Soil Taxonomy comprises all alterations authorized because the e-book of the second one variation of Soil Taxonomy: A uncomplicated procedure of Soil class for Making and examining Soil Surveys (1999). essentially the most major alterations within the 11th variation is the addition of the suborders Wassents and Wassists for subaqueous Entisols and Histosols.
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Extra info for Keys to Soil Taxonomy
59 JD. Other Alfisols that have a xeric soil moisture regime. Xeralfs, p. 71 JE. Other Alfisols. Udalfs, p. 47 Aqualfs Key to Great Groups JAA. Aqualfs that have a cryic soil temperature regime. Cryaqualfs, p. 37 JAB. Other Aqualfs that have one or more horizons, at a depth between 30 and 150 cm from the mineral soil surface, in which plinthite either forms a continuous phase or constitutes one-half or more of the volume. Plinthaqualfs, p. 43 JAC. Other Aqualfs that have a duripan. Duraqualfs, p.
D I A 24 Aquic Conditions Soils with aquic (L. aqua, water) conditions are those that currently undergo continuous or periodic saturation and reduction. The presence of these conditions is indicated by redoximorphic features, except in Histosols and Histels, and can be verified by measuring saturation and reduction, except in artificially drained soils. Artificial drainage is defined here as the removal of free water from soils having aquic conditions by surface mounding, ditches, or subsurface tiles or the prevention of surface or ground water from reaching the soils by dams, levees, surface pumps, or other means.
The control section of Histosols and Histels is divided somewhat arbitrarily into three tiers—surface, subsurface, and bottom tiers. 1. Otherwise, the surface tier extends from the soil surface to a depth of 30 cm. Some organic soils have a mineral surface layer less than 40 cm thick as a result of flooding, volcanic eruptions, additions of mineral materials to increase soil strength or reduce the hazard of frost, or other causes. If such a mineral layer is less than 30 cm thick, it constitutes the upper part of the surface tier; if it is 30 to 40 cm thick, it constitutes the whole surface tier and part of the subsurface tier.