Abstract: The automatic dispensing modular assembly includes plurality of granule dispensing modules to dispense a pre-set quantity of a selectable granular material out of different types of granular materials provided in different dispensing modules. Each granule dispensing module includes a canister sub-assembly (30) and a assembly (40) drive means. The canister sub-assembly (30) includes a granule canister (5) and a granule volumetric dozer (16) to dispense consistently and accurately a pre-set quantity of a granular material. The drive means according to one embodiment is a pneumatic cylinder sub-assembly (40) which includes a pneumatic cylinder (4) having piston rod (17) capable of imparting forward and backward motion to the granule conveyor (6) coupled to the piston rod (17) through granule conveyor coupler (15). The granular material is dispensed through granule dispensing tube (20) when the granule volumetric dozer (16) is brought in vertical alignment with the granule dispensing port (7).