Agricultural work machine

An agricultural work machine, in particular a tractor (1), with a drive motor (3) and a power take-off transmission (5) drivable thereby with an output-side power take-off shaft (6) for driving a work implement (2) mountable on the work machine (1), wherein the power take-off transmission (5) has a variable gear ratio (i 5), is characterized in that the gear ratio (i 5) of the power take-off transmission (5) is adjustable as a function of at least one operating parameter of the work machine (1) and/or the work implement (2).