A soil ripper comprising a disc is characterized in that spiked discs are mounted below the equipment for pulling attached implements. The spikes are in the form of a blade, a bayonet, a screw or another known form and are configured such as to penetrate the soil under the weight of the vehicle, and so as to correspond in length to the required tilling depth. A spiked disc can be disposed in a trailer frame and hingedly attached to said frame. The rear of the frame is provided with wheels for transporting the spiked discs by road, wherein a tractor raises the front part of the frame so that the wheels rest on the road and the spiked discs are sufficiently lifted off the road for transportation. Alternatively, a spiked plate is mounted on the wheels of the vehicle, said plate being attached to the body of the wheel by a rim. The rim on which the spiked plate is mounted is designed to allow quick and easy installation and removal under field conditions. In the case of dry soil, the disc is filled with a loose load or water to allow the spikes to penetrate fully into the soil. The spiked disc is provided with cleaning means which can be in the form of a T-shaped profile mechanically mounted on a frame, a cleaning blade passing between the spikes up to but not touching the disc, or the cleaning means is in the form of a cord or a bar tensioned below the spiked disc and mechanically fastened at each end to the frame in order to knock off clinging soil. The entire structure is designed so that the ground (soil) is worked under the weight of the spiked disc itself. The tractor simply enables movement. Since the vehicle does not pull a plough, but turns a wheel, which is much easier, and soil suitable for planting is obtained in a single pass, this allows two- to threefold time and fuel savings.Un scarificateur contenant un disque se distingue en ce que l'on installe sous un équipement tracté par des outils portés des disques à clous (désignés « DàC »). On utilise des clous
