Various classifications
Soils are classified according to very different criteria, and different countries sometimes adopt their own classifications. The most widespread classification today is the Soil Taxonomy of the USDA (United States Department of Agriculture), this is an objective classification that is based on the concept of «diagnostic horizon» (horizons are the horizontal layers that make up soils) and recognizes 12 orders, each of them with lower levels of hierarchy (from suborders to series). Classifications based on land use capacity, associated with the limitations that each soil may present, are also widespread.
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