reaches the boundary line 13 a control operation 16 2 is triggered control operation 16 2 results in the front mower unit 3 being swiveled in the vertical direction into a non working position 19 fig1 b according to fig1 c a control operation 16 3 is triggered when the rear adapted mower unit 4 has reached the boundary line 12 control operation 16 3 results in the rear mower unit 4 being raised into a non working position 19 depending on the structure of the control sequence 15 a control operation 16 4 results in deactivation of the front and rear p t o shafts 10 11 and so the mower units 3 4 are shut off before the agricultural working machine 5 is turned in a control operation 16 5 the ground speed of the agricultural working machine 5 is adapted to the travel in the headland region 13 this ground speed adapting can be either a reduction or an increase in the ground speed according to fig2 when the agricultural working machine 5 has finally passed through the headland region 13 and is moving along a predefined driving route 5 back toward the boundary line 12 that separates the headland region 13 from the territory 6 to be worked the previously activated control operations 16 1 16 5 are implemented once more in a different order that is the ground speed of the agricultural working machine is adjusted first control operation 16 5 next the front and rear p t o shafts 10 11 are actuated control operation 16 4 and the front mower unit 3 is lowered back into a working position 20 until the boundary line 12 is reached control operation 16 2 when the rear.