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- Therefore, the clear definition and designation of soil horizons and other layers are basic to soil classification. A soil horizon is a layer of mineral or organic soil material approximately parallel to the land surface that has characteristics altered by processes of soil formation.
sis.agr.gc.ca/cansis/taxa/cssc3/chpt02_a.htmlChapter 2: Soil, Pedon, Control Section, and Soil Horizons ...
A soil horizon is a layer of mineral or organic soil material approximately parallel to the land surface that has characteristics altered by processes of soil formation. It differs from adjacent horizons in properties such as color, structure, texture, and consistence and in chemical, biological, or mineralogical composition.
- Chapter 2
In this definition "naturally occurring" includes...
- Third Edition
The Canadian Soil Information Service is an authoritative...
- Chapter 2
B: A B horizon is a mineral horizon meaning it contains ≤ 17% organic C (about 30% organic matter) by weight. It is characterized by enrichment in organic matter, sesquioxides, or clay; or by the development of soil structure; or by a change of color denoting hydrolysis, reduction, or oxidation.
horizons – Mineral soil formed at the surface or be-low an O horizon, that exhibits litle or no remnant rock structure, and one or more of: an accumulation of humified organic mater in-timately mixed with the mineral fraction, and not dominated by properties characteristic of E or B horizons;
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).
An “A” horizon is a histic epipedon (one or more horizons) that is characterized by saturation (for 30 days or more, cumulative) and reduction for some time during normal years (or is artificially drained) and either: Consists of organic soil material (see below) that:
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Organic horizons. Named layers and materials of Organic soils. Tests for distinguishing organic layers. von Post scale of decomposition. Rules concerning horizon and layer designations. Need for precise definitions of horizons and layers. Chapter 3 Outline of the System and a Key to the Classification of a Pedon.
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Oct 26, 2024 · A soil layer is a zone in the soil, approximately parallel to the soil surface, with properties different from layers above and/or below it. If at least one of these properties is the result of soil-forming processes, the layer is called a soil horizon.
