A method of manufacturing an agricultural tillage disk blade includes providing a substantially circular-shaped disk body with an outer peripheral edge and a central opening that defines a rotation axis, the outer body being disposed within a first plane. A plurality of waves is formed in a predetermined pattern in the outer peripheral edge of the disk body, and the outer peripheral edge is sharpened to form a plurality of teeth such that at least a portion of the sharpened outer peripheral edge is disposed within a second plane that is parallel to the first plane and substantially perpendicular to the rotation axis. The method also includes machining a plurality of relief portions in each of the plurality of waves at a location radially inward of the plurality of teeth, and heat treating the disk body after the sharpening and machining steps.

A method of manufacturing an agricultural tillage disk blade includes providing a substantially circular-shaped disk body with an outer peripheral edge and a central opening that defines a rotation axis, the outer body being disposed within a first plane. A plurality of waves is formed in a predetermined pattern in the outer peripheral edge of the disk body, and the outer peripheral edge is sharpened to form a plurality of teeth such that at least a portion of the sharpened outer peripheral edge is disposed within a second plane that is parallel to the first plane and substantially perpendicular to the rotation axis. The method also includes machining a plurality of relief portions in each of the plurality of waves at a location radially inward of the plurality of teeth, and heat treating the disk body after the sharpening and machining steps.

A drawbar apparatus is provided for coupling an earth-working tool to a frame of an agricultural implement. The drawbar apparatus comprises a drawbar. The drawbar comprises a first portion coupled to the frame and a second portion. A joint comprises a first bracket comprising a protrusion. The protrusion defines a first aperture. The first bracket is coupled to one of the second portion of the drawbar and the earth-working tool. A second bracket defines a channel configured to receive the protrusion. The channel defines a second aperture on a first side of the channel and a third aperture on a second side of the channel. The second bracket is coupled to the other of the second portion of the drawbar and the earth-working tool. A fastener is positioned through the first aperture, the second aperture, and the third aperture. The protrusion is configured to move laterally in the channel.

A ground engaging agricultural tillage blade having a central opening adapted to be attached to an implement for rotation about a substantially horizontal axis of rotation; the blade having an outer periphery; and reinforcing flutes disposed in the plate from a location substantially at the outer periphery to a location adjacent the central opening. The blade can be used with a hub disposed around the central opening, a hub that covers at least a portion of the flutes or a spacer on a shaft extending through the central openings of adjacent blades, the spacers extending radially outwardly by a distance sufficient to place a portion of the spacer in abutment with at least a portion of the flutes.

A ground engaging agricultural tillage blade having a central opening adapted to be attached to an implement for rotation about a substantially horizontal axis of rotation; the blade having an outer periphery; and reinforcing flutes disposed in the plate from a location substantially at the outer periphery to a location adjacent the central opening. The blade can be used with a hub disposed around the central opening, a hub that covers at least a portion of the flutes or a spacer on a shaft extending through the central openings of adjacent blades, the spacers extending radially outwardly by a distance sufficient to place a portion of the spacer in abutment with at least a portion of the flutes.

A coulter holder having a frame connection for attaching to a machine frame and a coulter connection for attaching a coulter unit, wherein the coulter connection is pivotable relative to the frame connection between a working position and a raised position about a pivot axis via an actuating element and is lockable relative to the frame connection via a locking mechanism for fixing the coulter unit in the working position, wherein the locking mechanism is operatively connected to the actuating element and can be actuated by actuating the actuating element.

A coulter holder having a frame connection for attaching to a machine frame and a coulter connection for attaching a coulter unit, wherein the coulter connection is pivotable relative to the frame connection between a working position and a raised position about a pivot axis via an actuating element and is lockable relative to the frame connection via a locking mechanism for fixing the coulter unit in the working position, wherein the locking mechanism is operatively connected to the actuating element and can be actuated by actuating the actuating element.