Abstract: A ground engaging agricultural blade, coulter, or disc having a central opening adapted to be attached to an implement for rotation about a substantially horizontal axis of rotation; the coulter or disc have an outer periphery; and plurality of step plane notches disposed in the outer periphery. The blade can be used with a hub disposed around the central opening or a spacer spool on a shaft extending through the central openings of adjacent blades, the spacer spools extending radially outwardly by a distance.

Abstract: An agricultural device with a wear resistant coating comprising a shank portion that may be attached to an agricultural implement. First and second rear wings connect to an intermediate portion that connects to the shank portion. First and second shoulders are formed at the points where the rear wings meet the intermediate portion, and a patch of wear resistant coating is applied at each of the first and second shoulders. A first edge tapers forwardly from the first rear wing to a point, and a second edge tapers forwardly from the second rear wing to the point. Wear resistant coating may also be applied to the first and second edges or the point. Wear resistant coating may be applied to the agricultural device in a pattern that is specific to soil type.

Abstract: 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.