Rotary harrows

A rotary harrow having a frame with a plurality of soil-working members journalled in a portion of said frame, said soil-working members comprising upwardly extending shafts rotatably mounted on said frame portion and said shafts being located side by side in a row that extends transverse to the normal direction of travel a single support extending substantially radially from the lower end of each shaft and the inner end of said support being attached to said shaft, soil-working tine means in a holder of said support and said support with tine means being located at only one side of the axis of rotation of said shaft, the distance between said tine means and the shaft of each corresponding soil-working member being greater than half the distance between two neighboring shafts and said members being positioned to work overlapping strips of soil, said shafts being in driving engagement with driving means that rotates adjacent shafts and their corresponding supports in relative opposite directions, pinions on said shafts being in driving engagement with one another and neighboring pinions being in mesh, said soil-working members being arranged in two groups which rotate in relative opposite directions, the members of a first group being flanked at their opposite sides by members of a second group along said row and consecutive soil-working members of each group being out of phase by multiples of about 90.degree. from one another about their respective shafts, and when said harrow is viewed from the rear, the first leftmost support of the first group extending forwardly and about 180.degree., with respect to the first leftmost support of the second group.