Abstract: A gravimetric dosing apparatus having a support frame, a plurality of loading hoppers for a respective granular material to be dosed, carried by said support frame and provided with a respective discharge outlet and an opening-closing device for their respective discharge outlet, a weighing hopper provided with a discharge outlet and an opening and closing device for its respective discharge outlet and arranged in cascade with respect to said loading hoppers to receive from at least two of said hoppers dosed quantities of different granular materials, a support element articulated to said frame and designed to overhangingly support said weighing hopper, transducing means located between said frame and said articulated support element and designed to generate output signals proportional to the weight of the material discharged into said weighing hopper, a mixing assembly carried by said support frame and arranged in cascade with respect to said weighing hopper whereby dosed and weighed granular material is rec