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 genetically 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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