Why does topsoil have much more humus than subsoil?
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top soil have much more humus than subsoil because, all the dead animals and plants get decomposed in the top soil
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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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