The depth of soil horizon is the depth of a layer of soil or soil material
approximately parallel to the land surface and differing from adjacent related
layers in physical, chemical, and biological properties or characteristics.
Soil horizon properties of interest include color, structure, texture,
consistency, kinds and numbers of organisms present, and degree of acidity or
alkalinity. The deeper the soil horizon, the more protection provided since
chemicals have further to move and more time to degrade.
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