Method for regulating the actual mass flow (ṁ actual) of spreading material of at least one regulated metering unit of a disc spreader with at least one distribution disc associated with the metering unit, wherein a target mass flow (ṁ nominal) of spreading material depending on at least one parameter from the group - current vehicle speed of the disc spreader; - target spreading quantity per unit area; and - working width is determined and said target mass flow (ṁ nominal) is input to a computer-based regulating device as a reference value, wherein on the one hand at least one sensor-determined controlled variable representative of the actual mass flow (ṁ actual) from the group - torque of at least one shaft in a drive train of the distribution disc; - torsion of at least one shaft in a drive train of the distribution disc; - pressure difference of a hydraulic motor used to drive the distribution disc; and - current drain of an electric motor used to drive the distribution disc is also input to the regulating device and on the other hand the sensor-determined actual revolution rate of the distribution disc or of at least one shaft in the drive train thereof is input to the regulating device, whereupon in a regulating mode of the regulating device the deviation of the actual mass flow (ṁ actual) of spreading material from the target mass flow (ṁ nominal) of spreading material is determined and depending on the actual revolution rate of the distribution disc or of the shaft in the drive train thereof an actuating variable representative of the opening position of the metering unit is generated in order to readjust the metering unit to the target mass flow (ṁ nominal), characterized in that - while a, in particular predetermined, maximum value of changes of the sensor-determined revolution rate of the distribution discs or of the shaft in the drive train thereof is exceeded and/or - while the signal-to-noise ratio of the sensor-determined controlled variable representative of the actual mass flow (ṁ actual) is below a, in particular predetermined, minimum value, the regulating device - is set into a control mode or - activates a control mode of a control device, wherein in the control mode an actuating variable representative of the opening position of the metering unit is generated independently of the sensor-determined controlled variable that is representative of the actual mass flow (ṁ actual) in order to control the metering unit of the distribution disc independently of said controlled variable. - current vehicle speed of the disc spreader; - target spreading quantity per unit area; and - working width - torque of at least one shaft in a drive train of the distribution disc; - torsion of at least one shaft in a drive train of the distribution disc; - pressure difference of a hydraulic motor used to drive the distribution disc; and - current drain of an electric motor used to drive the distribution disc - while a, in particular predetermined, maximum value of changes of the sensor-determined revolution rate of the distribution discs or of the shaft in the drive train thereof is exceeded and/or - while the signal-to-noise ratio of the sensor-determined controlled variable representative of the actual mass flow (ṁ actual) is below a, in particular predetermined, minimum value, - is set into a control mode or - activates a control mode of a control device, wherein in the control mode an actuating variable representative of the opening position of the metering unit is generated independently of the sensor-determined controlled variable that is representative of the actual mass flow (ṁ actual) in order to control the metering unit of the distribution disc independently of said controlled variable.