Rotary harrows

A rotary harrow comprising a frame with coupling means at the front of said frame for attaching the harrow to a prime mover, a plurality of soil working members rotatably mounted in a row on upwardly extending shafts supported on a portion of said frame and said row extending transverse to the direction of travel, driving means connected to at least some of said shafts to rotate said soil working members and the lower end of each driven shaft having a substantially horizontal portion which extends substantially perpendicular to the axis of rotation of the corresponding soil working member, said horizontal portion supporting at least one straight blade-like soil working element that extends in an inclined outward position with respect to its corresponding axis of rotation, the diameter of the path described by the lower end of said blade-like element exceeding the distance between the driven shafts of two neighboring soil working members so that overlapping paths are worked by those members, the leading edge of said blade-like element, with respect to the normal direction of rotation of its corresponding soil working member, having a straight cutting edge part that extends rearwardly and downwardly for at least two-thirds of the length of said blade-like element to said lower end, the rear edge of said blade-like element extending substantially straight and downwardly towards said lower end and substantially parallel to the shaft of the corresponding soil working member when that element is viewed from the side, said cutting edge part being located closer to the axis of rotation of the corresponding soil working member than is said rear edge.