The harrow moves in a stable manner so that the clod crushing planks (7,7') can effectively process the ground surface, rendering it as even and smooth as possible in order that a rear depth maintenance holder (2) can run satisfactorily over it. The planks (7,7') form part of at least two articulated parallelograms (8,8',9,9',10,10',11,11') fitted on the harrow frame, with an appropriate operating component (13) for adjustment of the plank depth penetration without altering the depth adjustment for other parts of the harrow.
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