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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.
There are 12 soil orders (the top hierarchical level) in soil taxonomy. [2] [3] The names of the orders end with the suffix -sol. The criteria for the different soil orders include properties that reflect major differences in the genesis of soils. [4] The orders are: Alfisol – soils with aluminium and iron.
The archive is typically unique at the present times, for it is the only archive that holds nearly 6000 maps online related to soils and are freely accessible to the public around the world. Moreover, the major focus of the EuDASM initiative is towards the developing nations of Africa , South America , Asia etc., in order to assist them to ...
Soil taxonomy based soil map units are additionally sorted into classes based on technical classification systems. Land Capability Classes, hydric soil, and prime farmland are some examples. The European Union uses the World Reference Base for Soil Resources (WRB), currently the fourth edition is valid. [5]
Map of the United States showing what percentage of the soil in a given area is classified as an Ultisol-type soil. The great majority of the land area classified in the highest category (75%-or-greater Ultisol) lies in the South and overlays with the Piedmont Plateau, which runs as a diagonal line through the South from southeast (in Alabama) to northwest (up into parts of Maryland).
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Such maps are typically richer in context and show higher spatial detail, yet are not necessarily more accurate than traditional soil maps. Soil maps produced using (geo)statistical technique can also include an estimate of the model uncertainty. [3] An example of a traditional soil map showing soil mapping units, described soil profiles and ...