Abstract: A silt fencing for use at a construction site to prevent soil erosion by wind and water forces and comprises in combination a flexible plastic fencing material, a plurality of post units comprising about three contiguous elongated hollow tubes, consisting of a central tube adapted to receive a retractable stabilizing component such as a steel rebar for insertion in the ground and two outer tubes each having a slit along their length to accommodate the rigid rods attached to the fencing material.