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Did you know that there are six layers in the soil horizons?
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Nov 27, 2015 · This video gives the soil horizons definition and covers the surface horizon, subsoil, and substrat... Learn about the major soil horizons in this video lesson.
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Most soils have three major horizons (A, B, C) and some have an organic horizon (O). The horizons are: O – (humus or organic) Mostly organic matter such as decomposing leaves. The O horizon is thin in some soils, thick in others, and not present at all in others. A - (topsoil) Mostly minerals from parent material with organic matter incorporated.
The horizon description system begins by splitting soil horizons into two distinct groups: organic and mineral horizons. Organic horizons are those that contain 17% or more organic carbon; mineral horizons have less than 17% organic carbon.
Although these horizons form above the mineral soil surface, they may be buried by mineral soil and therefore be found at greater depth. H horizons may be overlain by O horizons that especially form after drainage.
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What are O horizons?
Most soils have three major horizons (A, B, C) and some have an organic horizon (O). The horizons are: O (humus or organic): Mostly organic matter such as decomposing leaves. The O horizon is thin in some soils, thick in others, and not present at all in others. A (topsoil): Mostly minerals from parent material with organic matter incorporated ...
