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The 106 Soil Units form 26 Soil Groups. The FAO soil map was a very simple classification system with units very broad, but was the first truly international system, and most soils could be accommodated on the basis of their field descriptions. The FAO soil map was intended for mapping soils at a continental scale but not at local scale.
World Soil Resources Reports 106, FAO, Rome 2015. ISBN 978-92-5-108369-7 (PDF 2,3 MB). IUSS Working Group WRB: World Reference Base for Soil Resources 2006. World Soil Resources Reports 103. FAO, Rome 2006. ISBN 92-5-105511-4. FAO: World Reference Base for Soil Resources, by ISSS–ISRIC–FAO. World Soil Resources Reports 84. FAO, Rome 1998.
The Global Soil Partnership, [2] GSP, was initiated by the Food and Agriculture Organization (FAO) and its members with the hope to improve governance of the limited soil resources of the planet in order to guarantee healthy and productive soils for a food-secure world, as well as support other essential ecosystem services.
FAO stated that Land suitability is the fitness of a given type of land for a defined use. The land may be considered in its present condition or after improvements. The process of land suitability classification is the appraisal and grouping of specific areas of land in terms of their suitability for defined uses.
Soil texture triangle showing the USDA classification system based on grain size. For soil resources, experience has shown that a natural system approach to classification, i.e. grouping soils by their intrinsic property (soil morphology), behaviour, or genesis, results in classes that can be interpreted for many diverse uses.
In 1992, Agenda 21, adopted at the United Nations Conference on Environment and Development, called for the preparation of "periodic state of the world reports" on plant genetic resources for food and agriculture and the preparation of a "rolling global cooperative plan of action" for these resources. [11]
Main entrance of the 2022 edition of the World Congress of Soil Science in Glasgow, United Kingdom World Congress of Soil Science held in Philadelphia, U.S., in 2006. The World Congress of Soil Science (WCSS) is a conference held every four years (although interrupted by World War II) under the guidance of the International Union of Soil Sciences (IUSS).
In the FAO soil classification for the FAO/UNESCO Soil Map of the World (1974) the Leptosols on calcareous rock were called Rendzinas, those on acid rock were Rankers. The very shallow, less than 10 cm deep, Lithic Leptosols in mountain regions are the most extensive Leptosols on Earth .