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A phrase used in the WRB Classification to mean either a doubling of the clay content within a vertical distance of 7.5 cm if the overlying horizon has less than 20% clay, or an absolute increase in clay of 20% within 7.5 cm if the overlying horizon has 20% or more clay. In this case some part of the lower horizon should have at least twice the clay content of the upper horizon (FAO, 2001, Annex 2).
Bibliography
FAO, 2001. Lecture notes on the major soils of the world. World Soil Resources Reports, 94. Rome: Food and Agriculture Organization of the United Nations, 334 pp.
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(2008). Abrupt Textural Change. In: Chesworth, W. (eds) Encyclopedia of Soil Science. Encyclopedia of Earth Sciences Series. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-3995-9_4
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