The difference between Humus and Mulch
When used as nouns, humus means a large group of natural organic compounds, found in the soil, formed from the chemical and biological decomposition of plant and animal residues and from the synthetic activity of microorganisms, whereas mulch means any material used to cover the top layer of soil to protect, insulate, or decorate it, or to discourage weeds or retain moisture.
Mulch is also verb with the meaning: to apply mulch.
check bellow for the other definitions of Humus and Mulch
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Humus as a noun:
A large group of natural organic compounds, found in the soil, formed from the chemical and biological decomposition of plant and animal residues and from the synthetic activity of microorganisms
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Humus as a noun:
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Mulch as a noun (agriculture, horticulture):
Any material used to cover the top layer of soil to protect, insulate, or decorate it, or to discourage weeds or retain moisture.
Examples:
"An organic mulch is a mulch made of natural substances such as leaves or grass clippings."
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Mulch as a noun (countable, agriculture):
A material used as mulch, as a decorative redwood bark mulch.
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Mulch as a verb (agriculture):
To apply mulch.
Examples:
"Mulch your vegetable garden to retain moisture and keep weeds down."
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Mulch as a verb (agriculture):
To turn into mulch.
Examples:
"I decided to mulch the grass clippings."