An agricultural machine (10) with an implement (12) for working a row culture (14), wherein the row culture (14) comprises working rows (16) which are substantially arranged parallel to one another and/or interference rows (18) which are arranged at an angle to the working rows (16), and wherein the implement (12) comprises at least one controllably moveable working section (22) with at least one activatable working device (24) for working the row culture (14), a control unit (28) for controlling the at least one working section (22) and/or working device (24) relative to at least one working row (16), and at least one optical sensor unit (30) which is connected to the control unit (28) for generating an image of at least one part of the row culture (14), wherein based on the image of the row culture (14) a sensor signal (S) for controlling the working section (22) and/or working device can be generated. According to the invention, the control unit (28) is equipped and designed so as to evaluate a validity of the sensor signal (S) for controlling the at least one working section (22) and/or working device based on at least one evaluation parameter.
