World reference base for soil resources 2006
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This publication is a revised and updated version of World Soil Resources Reports No. 84, a technical manual for soil scientists and correlators, designed to facilitate the exchange of information and experience related to soil resources, their use and management. The document provides a framework for international soil classification and an agreed common scientific language to enhance communication across disciplines using soil information. It contains definitions and diagnostic criteria to rec ognize soil horizons, properties and materials and gives rules and guidelines for classifying and subdividing soil reference groups.