Agricultural rotary disc mower

A method of using an agricultural machine system, the method comprising the steps of:

• providing that the agricultural machine system includes an agricultural work vehicle and an agricultural work machine coupled with the agricultural work vehicle, the agricultural work machine being configured for mowing a crop material and including a frame, a plurality of rotary discs, and a rock guard apparatus, the plurality of rotary discs being coupled with the frame and including a first rotary disc and a second rotary disc, the plurality of rotary discs each including a rotational axis, the rock guard apparatus being coupled with the frame and positioned below the plurality of rotary discs;
• and
• coupling at least one knife with the frame, the at least one knife being configured for cutting the crop material and positioned between the rotational axis of the first rotary disc and the rotational axis of the second rotary disc.