7. What is humus? what is humus ?
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In soil science, humus denominates the fraction of soil organic matter that is amorphous and without the "cellular cake structure characteristic of plants, micro-organisms or animals".
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Humus is dark, organic material that forms in soil when plant and animal matter decays. When plants drop leaves, twigs, and other material to the ground, it piles up. This material is called leaf litter. ... The thick brown or black substance that remains after most of the organic litter has decomposed is called humus...
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