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Which soil layer contains the most humus?

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Quick Answer

The O horizon soil layer contains the most humus. This layer is the topmost layer of most types of soil. The O horizon layer is primarily composed of decomposed plant litter and humus.

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Full Answer

Humus is a semi-soluble organic matter that is created from decomposed fungi and bacteria. Humus gives the upper layer of soil a dark brown to black color. Organisms add humus and nutrients to the soil through plant litter and the process of decomposition. This process influences the soil���s structure and fertility. Soil organisms, such as earthworms, beetles and termites, vertically redistribute humus within the mineral matter found beneath the soil's surface.

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