Rotary harrows

A harrow comprising a frame having coupling means connectable to the lift of a tractor and a plurality of rotatable soil-working members mounted on said frame in a row extending transverse to the direction of travel, said soil-working members comprising tines mounted for rotation about upwardly extending axes that are supported on an elongated part of said frame, an elongated roller coextending with said row and positioned at the rear thereof to trail behind said soil-working members, said frame depending from an elongated supporting structure that coextends with said frame and said structure comprising a front part and rear, forwardly extending arms adjacent the lateral ends of said structure said roller being connected to said arms, said arms being interconnected to the rear of said supporting structure by adjustment means for varying the position of said arms up and down relative to said supporting structure and the latter being connected to said arms intermediate their ends, locking means at the lateral ends of said frame part for locking said arms against movement relative to said supporting structure, and said locking means also being connected to said arms intermediate the ends thereof, said arms being pivotally connected to the front part of said supporting structure and being fixable in chosen angular setting about said pivot connections by said locking means, said roller including a central tube-like support and a plurality of rod-like elements being spaced from said tube-like support, said rod-like elements extending generally transverse to the direction of travel and being helically positioned with respect to the center line of said tube-like support, hole means on said roller for supporting said rod-like elements and means detachably mounting said rod-like elements in, said hole means.