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NAL Agricultural Thesaurus
U.S. Department of Agriculture

Concept Breadcrumbs

Fields of Study > chemistry > chemical composition > organic matter > soil organic matter > mor
Fields of Study > soil science > soil chemistry > soil biochemistry > soil organic matter > mor
Fields of Study > soil science > soil biology > soil biochemistry > soil organic matter > mor
Preferred Term:

mor

Definition:
A layer of organic material made up of largely unrecognizable plant debris and their decomposition products overlain by litter and lying on the surface of, and essentially unmixed with, the mineral soil. Earthworms are absent.
Concept Schemes:
NALT Full
Broader Concept:
soil organic matter
URI:
https://lod.nal.usda.gov/nalt/53430
Download this Concept:
RDF/XMLCreated 2006-01-19, last modified 2014-07-31