argillic horizon

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• alfisol — /al feuh sawl , sol /, n. a fertile soil of humid regions that occurs worldwide, esp. where native broadleaf forests were established, and is highly productive for agriculture. [1970 75; alf (according to the U.S. Soil Conservation Service,… …   Universalium

• Brown earth — is a type of soil. Brown earths are mostly located between 30° and 55° north of the Equator. The largest expanses cover western and central Europe, large areas of western and trans Uralian Russia, the east coast of America and eastern Asia. Here …   Wikipedia