Guidelines for Soil description, 4th Edition

These guidelines are based on the internationally accepted Guidelines for Soil Description (FAO, 1990). Some new international developments in soil information systems and soil classification, such as the Field Book for Describing and Sampling Soils (Schoeneberger et al., 2002) and Keys to Soil Taxonomy (USDA Soil Survey Staff,2003), Updated Global and National Soils and Terrain Digital Databases (ISRIC, 2005) and the second edition of the World Reference Base for Soil Resources (IUSS Working Group WRB, 2006) are taken into consideration.