A self-propelled forage harvester, comprising - a plurality of working units, as well as - at least one treatment device, wherein at least one working unit is formed by a chopping unit and at least one further working unit is formed by a sharpening means, wherein the chopping unit has a chopping drum which can be driven in rotation about an axis of rotation as well as a plurality of knives mounted on the chopping drum, wherein the sharpening means comprises at least one sharpening element which is suitable for coming into sharpening contact with knife edges of the knives during a sharpening procedure and for sharpening the knife edges in this manner, wherein the sharpening element is configured so as to be movable relative to the chopping unit, so that the sharpening element can reach at least substantially all points of the knife edges during a sharpening procedure, wherein the treatment device comprises at least one container (10, 14) for holding a flowable treatment medium, at least one line (11, 15) for guiding the treatment medium from the container (10, 14) in the direction of the sharpening means, as well as a plurality of nozzles, by means of which the treatment medium can be dispensed, wherein the nozzles are spaced along the chopping drum as well as being disposed so as to correspond to a range of movement of the sharpening element, so that during a sharpening procedure, the treatment medium can be guided onto the sharpening element by means of the nozzles, characterized in that the nozzles can be activated and deactivated in alternation during a sharpening procedure as a function of a current position of the sharpening element. - a plurality of working units, as well as - at least one treatment device, wherein at least one working unit is formed by a chopping unit and at least one further working unit is formed by a sharpening means, wherein the chopping unit has a chopping drum which can be driven in rotation about an axis of rotation as well as a plurality of knives mounted on the chopping drum, wherein the sharpening means comprises at least one sharpening element which is suitable for coming into sharpening contact with knife edges of the knives during a sharpening procedure and for sharpening the knife edges in this manner, wherein the sharpening element is configured so as to be movable relative to the chopping unit, so that the sharpening element can reach at least substantially all points of the knife edges during a sharpening procedure, wherein the treatment device comprises at least one container (10, 14) for holding a flowable treatment medium, at least one line (11, 15) for guiding the treatment medium from the container (10, 14) in the direction of the sharpening means, as well as a plurality of nozzles, by means of which the treatment medium can be dispensed, wherein the nozzles are spaced along the chopping drum as well as being disposed so as to correspond to a range of movement of the sharpening element, so that during a sharpening procedure, the treatment medium can be guided onto the sharpening element by means of the nozzles, characterized in that the nozzles can be activated and deactivated in alternation during a sharpening procedure as a function of a current position of the sharpening element. wherein at least one working unit is formed by a chopping unit and at least one further working unit is formed by a sharpening means, wherein the chopping unit has a chopping drum which can be driven in rotation about an axis of rotation as well as a plurality of knives mounted on the chopping drum, wherein the sharpening means comprises at least one sharpening element which is suitable for coming into sharpening contact with knife edges of the knives during a sharpening procedure and for sharpening the knife edges in this manner, wherein the sharpening element is configured so as to be movable relative to the chopping unit, so that the sharpening element can reach at least substantially all points of the knife edges during a sharpening procedure, wherein the treatment device comprises at least one container (10, 14) for holding a flowable treatment medium, at least one line (11, 15) for guiding the treatment medium from the container (10, 14) in the direction of the sharpening means, as well as a plurality of nozzles, by means of which the treatment medium can be dispensed, wherein the nozzles are spaced along the chopping drum as well as being disposed so as to correspond to a range of movement of the sharpening element, so that during a sharpening procedure, the treatment medium can be guided onto the sharpening element by means of the nozzles, characterized in that the nozzles can be activated and deactivated in alternation during a sharpening procedure as a function of a current position of the sharpening element.