Abstract: An implement for preparing a field includes a ground engaging device that allows the implement to be pushed or pulled on the field. The ground engaging device includes a reversible roller with projections joined to an outer surface thereof to engage the ground. The projections do not extend along the complete length of the roller but rather a portion thereof thereby reducing the power necessary to rotate the roller. The implement includes reversible guards for keeping the disturbed ground in front of the roller.

Abstract: An implement for gathering objectionable rocks and debris from the ground including a positive stop for limiting the range of displacement of the gathering mechanism relative to the ground. In the embodiment described, the gathering mechanism comprises a first roller to engage the ground to dislocate rocks and debris therefrom; and a second roller forming a gap above the first roller through which only selected rocks and debris may pass. The height of the first and second rollers in reference to the ground is vertically adjustable. The first and second roller are displaced upward by large forces placed upon the first roller.

Abstract: A rock rake fiber gathering into a row or a gathering area objectional rocks and debris from the ground where a first roller engages such rocks and debris and a deflector forms a gap therebetween through which only un-objectionable rocks and debris may pass. The adjustable rock rake having an actuator for adjusting the angle of the roller and deflector. The adjustable rock rake having guards about the end of the roller such that a gathering area is formed for the accumulation of rocks and debris. The guards being removable and storable upon the frame of the adjustable rock rake.