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Organic layers less than 40 cm in thickness that overlie a mineral soil are recognized as a phase in the Canadian System of Soil Classification. For example, a Humic Luvic Gleysol with a 30-‐cm organic surface layer would be classified as a Humic Luvic Gleysol, peaty phase.
- Horizons
The major symbols used in describing mineral soil layers in...
- Horizons
PODZOLIC B HORIZON: A Bf, Bh, Bfh, or Bhf horizon that meets the following criteria: It is at least 10 cm thick. Color criteria for the horizon: Bf: Hues of 7.5YR or redder, or its hue must be 10YR near the upperboundary and become yellower with depth.
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The major symbols used in describing mineral soil layers in Canada are shown in the following tables. The assignment of mineral soil layers to each horizon is done by comparing the properties of the horizons in the field to a list of distinctive characteristics, called diagnostic properties.
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.
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;
Soil profiles can show distinct or indistinct layers called soil horizons (see Figure 11). Soil profiles can be used to quickly compare ground characteristics between different locations and to assess whether or not a location is suitable for tasks such as farming.
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Soil horizons, properties and materials are intended to reflect features which are widely recognized as occurring in soils and which can be used to describe and define soil classes.
