A control system for an agricultural toolbar (10) dragged across a ground surface by means of a tractor (5), comprising: a wheel (1550) coupled to the toolbar and adapted to the surface of the ground, an actuator (1317) having an actuator pressure, said actuator (1317) being coupled to the toolbar； characterized by: said actuator (1317) being arranged so that it modifies a ground force between said wheel (1550) and the ground surface, said ground force being related to said actuator pressure, said actuator moving the toolbar between a transport position and a working position, and in which the weight of the toolbar (10) is supported by said wheel (1550) when in the transport position, a fluid control system (1330), said fluid control system being in fluid communication with said actuator (1317), said fluid control system (1330) being operable to control said actuator pressure, and an electric controller (1302), in electrical communication with said fluid control system (1330), wherein said electrical controller (1302) is operable to send a command signal to the fluid control system (1330), said command signal corresponding to a desired pressure, and wherein said fluid control system (1330) 25 is operable to modify said actuator pressure in response to said command signal such that said actuator pressure corresponds to said desired pressure, and wherein said fluid control system (1330) is operable to maintain said actuator pressure at said desired pressure.Un sistema de control para una barra de herramientas agrícolas (10) arrastrada a través de una superficie de terreno mediante un tractor (5), que comprende: una rueda (1550) acoplada a la barra de herramientas y que se adapta con la superficie del terreno, un actuador (1317) que tiene una presión de actuador, estando dicho actuador (1317) acoplado a la barra de herramientas； caracterizado por: estar dicho actuador (1317) dispuesto de modo que modifica una fuerza de suelo entre dicha rueda (1550) y la superficie del
