Soil Erodibility

• It is the inherent susceptibility of soil against external forces.
• It is ease with which a soil can be eroded.
• Function of soil physical characteristics and land management
• The erodibility of a soil is defined by its resistance to two energy sources:

a) the impact of raindrops on the soil surface, and

b) the shearing action of runoff between clods in grooves or rills.

• soil erodibility depends on mechanical composition of soil, such as sand, silt, and clay, presented by the ratio as

Erodibility(E) =  (%sand+%silt)/%clay

The range of particle diameter of clay, sand and silt is:

Clay = < 0.002 mm

Silt = 0.002 – 0.006 mm

Sand = 0.06 – 2.0 mm.