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Parameter Tree:
EARTH SCIENCE > LAND SURFACE > SOILS > ORGANIC MATTER
Definition:
Soil constituents consisting of a wide range of organic
(carbonaceous) substances, including living organisms, carbonaceous
remains of organisms which once occupied the soil, and organic compounds
produced by current and past metabolism in the soil. 
Reference:
The Nature and Properties of Soils, Prentice Hall, 1996.
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