The levelling board levels the earth flow between the tines and the roller and presses obstacles downwards. With the universal setting tool, the height of the levelling board can be adjusted. Irrespective of the working depth, the height of the levelling board is maintained as the levelling board is guided parallel to the roller. Where larger obstacles prevail, the integrated overload safety enables the levelling board to give way in an upward direction. If desired the levelling board can optionally be omitted.