The invention relates to controlling a driving condition for an agricultural machine having a tractor, an implement for applying materials selected from the group of granular material, liquid material, and a powder-form material, the implement carried or trailed by the tractor and comprising a supply container, an application device, and a weight sensor device having at least one weight sensor and configured to sense an empty weight and a filling weight for the supply container. A tractor implement management system is provided and is operationally connected to the weight sensor device and configured for controlling driving conditions of the tractor. The method comprises driving the tractor, measuring first weight signals, indicative of a first driving condition, providing first tractor control signals, generated in response to the first weight signals and configured to apply a first control condition to the tractor driving, for controlling the tractor driving.