“A” Horizon: Commonly
called topsoil, this is the layer where organic matter
accumulates. It is generally dark colored and is the
zone of plant growth. It also supports the growth of
bacteria, fungi, earthworms, insects and other life
Horizon: The subsoil is the zone where
other mineral particles accumulate but organic matter
does not. Its texture helps determine the type of
drainage available to the topsoil.
This is the parent material from which the soil above is formed. It
has not been affected by accumulation or leaching.
Horizon: The bottom layer consists of the bedrock from which parent material is derived.