The soil digging implement mounted behind a tractor has a plough share (27) which penetrates the soil to a suitable depth for aeration for agriculture or forestry. The plough share is attached by a hinge pin (21) to the leading edge of a swinging carrier (7) so that it can tilt through a small angle. The carrier is mounted on the horizontal lower leg (20) of a U-shaped support (6) at the bottom of a vertical limb (18). This limb carries an upper horizontal leg (15) connected by a hinge pin (16) to an S-shaped beam (S). This beam is supported by a parallelogram linkage (4.1) behind the tractor, rising and falling and controlled by a hydraulic cylinder (4) above. These movements are compensated by a vertical link (10) behind the vertical limb of the support (6). The top of this link is connected by an oscillating eccentric connector (13) to the top of a short parallel link (9) attached at the other end to the top of the support.
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