Soil Horizons

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What is Horizon O in soil?

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Horizon O, also known as the organic layer, is the topmost layer of soil, composed mainly of organic matter such as decomposed leaves and other plant material.

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What is Horizon A in soil?

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Horizon A, or topsoil, is the layer beneath Horizon O, rich in nutrients and organic matter, and is crucial for plant growth.

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What is Horizon E in soil?

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Horizon E, known as the eluviation layer, is characterized by the leaching of minerals and nutrients, resulting in a lighter color.

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What is Horizon B in soil?

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Horizon B, or subsoil, is the layer that accumulates minerals and nutrients leached from the upper layers, often denser and less fertile.

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What is Horizon C in soil?

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Horizon C, or parent material, consists of weathered rock and minerals from which the soil develops.

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What is Horizon R in soil?

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Horizon R, or bedrock, is the solid rock layer beneath all soil horizons, providing the foundation for soil formation.

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Which soil horizon contains the most humus?

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Horizon O contains the most humus due to the accumulation of decomposed organic matter.

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Which soil horizon is typically the least fertile?

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Horizon R is typically the least fertile as it is solid rock and does not support plant growth.

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What is leaching in the context of soil horizons?

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Leaching is the process by which water-soluble substances are washed out from the soil, often affecting Horizons E and B.

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What is the significance of Horizon B in soil?

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Horizon B is significant as it stores nutrients and minerals that are essential for plant growth.