Tutorial:WRB

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World Reference Base (WRB) Soil Classification
The WRB soil classification scheme is uses diagnostic horizons, properties and materials which to a large extent are observable and measurable in the field and is based around soil forming processes. The WRB is a two tier system consisting of:
 * The Reference Base consisting of 32 Reference Soil Groups (RSGs), and
 * The WRB Classification System consiting of a set of prefix and suffix qualifiers that can be appended to the RSG to give a precise classification.

The WRB is freely available on-line. Follow the external link below to access the full classifiation system. This includes a key to the Reference Soil Groups, information about diagnostic horizon, properties and materials, and a list of the classifying sub-divisions for the RSGs.