system and verfrahren to control a speed of an agricultural nutzmaschine (1) comprehensive means (17) for recording a first speed v1 of the agricultural nutzmaschine (1) by kontaktaufbau the ground on which the agricultural nutzmaschine (1) drivein particular, an impeller / bodenrad with a induktionssensor； means (15) to capture a second speed v2 of the agricultural nutzmaschine (1) through one or more of the agricultural nutzmaschine (1) for contactless sensors, in particular a rada rsensor and / or a gps sensor； means to determine a valid speed vg.on the basis of the v1 and v2, and the means to determine a valid speed vg, a control unit (23) to include the control unit (23) is trained to match a predefined programmable threshold, vseach of the speeds v1 and v2, and is trained to set the current speed vg = v1； if the result of the comparison v1 is smaller than vs provides otherwise for setting the valid speed vg = v2, and if the result of the comparison v1 larger. r equal to vs provides.
