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- An O horizon is one in which organic material is a major constituent. Each O horizon is given a subscript to denote its organic character. In the US Soil Taxonomy, for example, the subscripts a, e, and i are used to denote strongly decomposed, moderately decomposed, and mostly undecomposed plant material.
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Each O horizon is given a subscript to denote its organic character. In the US Soil Taxonomy, for example, the subscripts a, e, and i are used to denote strongly decomposed, moderately decomposed, and mostly undecomposed plant material. The terminology used to describe soil morphology has sufficient breadth to encompass all soils.
- Hydric Soil - an overview | ScienceDirect Topics
It has therefore become convenient to determine the hydric...
- Hydric Soil - an overview | ScienceDirect Topics
diagnostic horizons of the U.S. Soil Taxonomy. Designa - tions of genetic horizons express a qualitative judgment (an interpretation derived from morphology and other soil properties) of pedogenesis believed to have taken place. Diagnostic horizons are quantitatively defined features used to differentiate between taxa in U.S. sys-tem of Soil ...
Examples include consociation, diagnostic horizon, taxadjunct, and pedon. The short commentary that accompanies many of the terms provides information about the importance of the item in soil classification, soil interpretation, or understanding soil genesis (see Cumulic subgroup for an example).
The removal of clay from the upper part of the solum (Ae) is expressed by a coarser soil texture relative to the underlying subsoil layers. The removal of iron is indicated usually by a paler or less red soil color in the upper part of the solum (Ae) relative to the lower part of the subsoil.
Each O horizon is given a subscript to denote its organic character. In the US Soil Taxonomy, for example, the subscripts a, e, and i are used to denote strongly decomposed, moderately decomposed, and mostly undecomposed plant material. The terminology used to describe soil morphology has sufficient breadth to encompass all soils.
Soil structure refers to the aggregation of primary soil particles into compound particles that are separated from adjoining aggregates by surfaces of weakness. Soil structure is classified in terms of grade or distinctness (weak, moderate, strong), class or size (fine, medium, coarse, very coarse), and type (granular, platy, prismatic, blocky).
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Soil morphology focuses on standardizing descriptions of soil properties and features in the field. Although often qualitative and empirical, these descriptions aid in the interpretation of soil properties measured in the laboratory through chemical, biological and physical methods.
