The invention relates to a chopping device for treating the residual stubble of field plants with adjustable position and/or ground pressure, in particular a shredding device (50) for mounting on a harvesting accessory (20), which is equipped with a working tool (54) for chopping plant residues (80), the position of the working tool (54) is adjustably mounted on the harvesting accessory (20) and amechanism for controlling the position of the holding device and/or the ground pressure during the harvesting operation, and the mechanism comprises a force-assisted actuator (74) coupled to the control device (92).