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- noun An abundant soil order in the USDA soil taxonomy, with a clay-enriched subsoil and relatively high native fertility, widely used both in agriculture and forestry.
from Wiktionary, Creative Commons Attribution/Share-Alike License
The soils of the Eagle Ford and Taylor Black Prairies are primarily clays of the order vertisol, while the soils of the White Rock Cuesta are mollisols and the Eastern Marginal Prairie of the order alfisol.
Effects of topsoil, rainfall, and fertilizer on finger millet on an alfisol in India.