Abstract: A plough shank having a rounded leading edge portion with a leading surface, a trailing portion, a web connecting the trailing and leading portions, an attachment mechanism at the top of the shank to enable attachment of the shank to a plough frame so that the leading surface is inclined by 60.degree. to 80.degree. to the horizontal, and a construction at the bottom of the shank to enable the attaching of a digging point thereto. The attachment mechanism may comprise a lobe integral with the shank and received in a clamp for attachment to a tool bar. The clamp may include two pivotably connected portions with an interconnected spring or hydraulic system.

Abstract: A plow shank has a digging blade attached to the lower extremity thereof by an adaptor. The digging blade has an inclined upper arcuate surface to which the adaptor is releasably secured. The adaptor is also releasably secured to the lower extremity of the shank, such that the blade is located below the lower extremity of the shank to enable the blade to present a low forward facing rounded profile.