![]() ![]() ![]() The next step was the Revised Legend of the Soil Map of the World, published in 1988. Many ideas from national soil classification systems were brought together in this worldwide-applicable system, among them the idea of diagnostic horizons as established in the '7th approximation to the USDA soil taxonomy' from 1960. ![]() The Legend for this map, published in 1974 under the leadership of Rudi Dudal, became the FAO soil classification. During the 20th century, the need for an international soil classification system became more and more obvious.įrom 1971 to 1981, the Food and Agriculture Organization (FAO) and UNESCO published the Soil Map of the World, 10 volumes, scale 1 : 5 M). Since the 19th century, several countries developed national soil classification systems. WRB, 4th edition (2022) Background History It is edited by a working group of the International Union of Soil Sciences (IUSS). The currently valid version is the fourth edition 2022. The World Reference Base for Soil Resources ( WRB) is an international soil classification system for naming soils and creating legends for soil maps. ![]()
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