Why does top soil have the most humus?
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It contains more organic material than the subsoil and so it is darker in color. Humus is the decayed remains of the plants and animals, which breaks down in the soil by the microbes. ... Therefore, this happens more in the topsoil, than in any other soil layer. Thus, the top layer of soil has more humus than other layers.
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It contains more organic material than the subsoil and so it is darker in color.
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