leaf mold

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leaf mold,

crumbly brown humushumus
, organic matter that has decayed to a relatively stable, amorphous state. It is an important biological constituent of fertile soil. Humus is formed by the decomposing action of soil microorganisms (e.g.
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 typical of forest floors. It is composed of decayed leaves and other plant material mixed with soil.
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leaf mold

[′lēf ‚mōld]
(geology)
A soil layer or compost consisting principally of decayed vegetable matter.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.