Ultisols, commonly known as red clay soils, are one of twelve soil orders in the United States Department of Agriculture soil taxonomy. They are defined as mineral soils which contain no calcareous material anywhere within the soil, have less than 10% weatherable minerals in the extreme top layer of soil, and have less than 35% base saturation thr...
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http://en.wikipedia.org/wiki/Ultisol
one of the 12 soil orders in the U.S. Soil Taxonomy. Ultisols are reddish, clay-rich, acidic soils that support a mixed forest vegetation prior to ... [2 related articles]
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http://www.britannica.com/eb/a-z/u/4
a weathered, red and yellow acidic soil of warm, humid areas that is agriculturally productive when treated with lime and organic fertilizers.
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https://www.infoplease.com/dictionary/ultisol
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