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Soil Horizon

Soil Horizon. Horizon. Horizon is a side profile of the layers of soil Soil is usually divided into 3 main layers, but will also include the layers above and below for a total of 5 layers. . Soil Horizons Diagram. Copy this into your notes. O Horizon: Litter N. A Horizon: Topsoil.

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Soil Horizon

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  1. Soil Horizon

  2. Horizon • Horizon is a side profile of the layers of soil • Soil is usually divided into 3 main layers, but will also include the layers above and below for a total of 5 layers.

  3. Soil Horizons Diagram Copy this into your notes O Horizon: LitterN A Horizon: Topsoil B Horizon: Subsoil C Horizon: Parent Material R Horizon: Bedrock

  4. O Horizon: Litter • Not really a layer of soil • It’s on top of the first layer of soil • Contains grass, plants, and animals

  5. A Horizon: Topsoil • 1st layer of soil • Darkest layer of soil (dark brown or black) • Contains humus, plant roots, small animals, water, and nutrients for plant growth • The darker the soil, the more nutrients it contains

  6. B Horizon: Subsoil • 2nd layer of soil • Lighter in color (reddish brown) • Fewer nutrients and water • Limited plant growth

  7. C Horizon: Parent Material • 3rd layer of soil • Lightest in color (gray) • No nutrients, animals, or plant growth • Contains weathered rock and sediment

  8. R Horizon: Bedrock • Below the last layer of soil • Solid Rock • Has not been weathered or broken down yet • No soil in this layer

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