Ultisoln.
/ˈʌltɪsɒl/ Soil Science.
A type of highly weathered, leached, red-yellow or red acid soil marked by a clay-rich B horizon and found in warm, humid climates.
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the world > the earth > structure of the earth > constituent materials > earth or soil > kind of earth or soil > [noun] > clayey soil
rosil1691
black cotton soil1814
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Ultisol1960
Vertisol1960
1960 Soil Classif.: 7th Approximation (U.S. Dept. Agric.) xv. 226/1 The Ultisols include most soils that have been called Red-Yellow Podzolic soils, Reddish-Brown Lateritic soils, and Rubrozems in the United States.
1972 J. G. Cruickshank Soil Geogr. iv. 132 In their geographical distribution, the Ultisols—otherwise known as red-yellow podsolics or ferruginous soils—merge into grassland soils on their arid margins and into Alfisols and Inceptisols (brown earths) on their cool humid margins (eg, in North America).
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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n.1960