In soil classification, an umbrisol is a soil with a dark topsoil and in which organic matter has accumulated within the mineral surface soil—in most cases with low base saturation—to the extent that it significantly affects the behaviour and utilization of the soil. Umbrisols are the counterpart of comparable soils with a high base saturation...
Found on
http://en.wikipedia.org/wiki/Umbrisol
one of the 30 soil groups in the classification system of the Food and Agriculture Organization (FAO). Umbrisols are characterized by a surface layer ...
Found on
http://www.britannica.com/eb/a-z/u/6
No exact match found.
