define humus and leaching
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the dark organic material in soils, produced by the decomposition of vegetable or animal matter and essential to the fertility of the earth is called humus.
Leaching is the loss or extraction of certain materials from a carrier into a liquid (usually, but not always a solvent). and may refer to: Leaching (agriculture), the loss of water-soluble plant nutrients from the soil; or applying a small amount of excess irrigation to avoid soil salinity.
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the organic component of soil, formed by the decomposition of leaves and other plant material by soil microorganisms.
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