A device for working soil, in particular for comminuting plant residues in the ground, the device consisting of: - a frame which is attached to a tractor that can move in a direction of travel, and - at least one roller which is rotatably mounted on the frame and extends transversely to the direction of travel of the frame, and on which at least one cutting tool is provided, - a groove-shaped, dovetail-shaped or box-shaped receiving opening incorporated into the roller for each of the cutting tools, - a profile on each of the cutting tools, which profile corresponds to the cross section of the receiving opening and can be inserted therein, a clearance being present between the profile and the inner wall of the receiving opening in the assembled state thereof, and the particular cutting tool being supported on the roller so as to be movable by a predefined pivot angle (α), characterized in that the length of the respective cutting tools is approximately half the size of the length of the roller and in that two of the cutting tools extending over the entire length of the roller extend in alignment with one another in such a way that the pairs of the cutting tools thus formed are fastened to the roller in the center thereof by means of screws, and in that an air gap is present between the respective pairs of cutting tools, such that each of the pairs of cutting tools supports one another as a stop in the center of the roller. - a frame which is attached to a tractor that can move in a direction of travel, and - at least one roller which is rotatably mounted on the frame and extends transversely to the direction of travel of the frame, and on which at least one cutting tool is provided, - a groove-shaped, dovetail-shaped or box-shaped receiving opening incorporated into the roller for each of the cutting tools, - a profile on each of the cutting tools, which profile corresponds to the cross section of the receiving opening and can be inserted therein, a clearance being present between the profile and the inner wall of the receiving opening in the assembled state thereof, and the particular cutting tool being supported on the roller so as to be movable by a predefined pivot angle (α), characterized in that the length of the respective cutting tools is approximately half the size of the length of the roller and in that two of the cutting tools extending over the entire length of the roller extend in alignment with one another in such a way that the pairs of the cutting tools thus formed are fastened to the roller in the center thereof by means of screws, and in that an air gap is present between the respective pairs of cutting tools, such that each of the pairs of cutting tools supports one another as a stop in the center of the roller. a clearance being present between the profile and the inner wall of the receiving opening in the assembled state thereof, and the particular cutting tool being supported on the roller so as to be movable by a predefined pivot angle (α), characterized in that the length of the respective cutting tools is approximately half the size of the length of the roller and in that two of the cutting tools extending over the entire length of the roller extend in alignment with one another in such a way that the pairs of the cutting tools thus formed are fastened to the roller in the center thereof by means of screws, and in that an air gap is present between the respective pairs of cutting tools, such that each of the pairs of cutting tools supports one another as a stop in the center of the roller.