chernozem (syn. black earth)
chernozem (syn. black earth)A zonal group of soils with deep fertile surface soil, dark brown to black in color, rich in organic matter, grading into lighter colored soil below, and having a calcium carbonate layer at a depth of 1.5 to 4 feet (45 to 120 cm.). These are often found under tall grasslands in a temperate to cool, somewhat humid climate.
GardenWeb Glossary of Botanical Terms
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