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the O-Horizon is the topmost soil so it has the most humus

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14y ago
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Anonymous

Lvl 1
3y ago
Thanks
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13y ago

The layer that contains the humus is called the topsoil.

Soil is divided in horizons called Soil horizons.

Soil horizons: A,B,C,D

Layer A is called topsoil

Layer B is called subsoil

Layer C is called partially weathered rock

Layer D is called unweathered rock.

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Wiki User

10y ago

Topsoil is the soil layer that has the most humus.

Specifically, the term humus designates the organic matter from decayed and decaying animal and plant matter. It is found in the 2 inches (5.08 centimeters) which comprise the topsoil's upper, O horizon and the 10 inches (25.4 centimeters) which make up the topsoil's lower, A horizon. It will not be found among the mixed clay, sand and silt particles in the subsoil or the bedrock, deposits and sediments in the substratum.

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Wiki User

9y ago

It is a proven fact that it is the topsoil layer or the A horizon layer.

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14y ago

I think the topsoil and ground level contain humus.

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13y ago

Horizon A i Believe

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13y ago

top soil

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Wiki User

11y ago

top layer

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Q: Which soil layer contains the most humus?
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