Abstract: A universal earth-loosening attachment useful with earth-moving vehicles. The attachment mounts to the back side of tractor and bulldozer blades. The attachment includes a spike which engages the earth for loosening the earth during backward motion of the vehicle and which automatically swings upwardly to drag inoperatively on the earth surface during forward motion of the vehicle. Adjustment means allow the spike to engage the earth at an optimum angle relative to the earth grade for efficient operation. The spike is self-storing in an upright position.