A solid fertilizer metering assembly belongs to the field of mechanisms used in agricultural machines and implements. The assembly 1 comprises a metering spindle 2 in a single cylindrical conical body, with constant screw turns 3 consisting of one or more constant screw turns which follow the initial helical screw angle, besides a casing 4 also of conical cylindrical shape, providing an empty space 5 at the end of the helical screw of the said metering spindle 2 and an outlet 6 for the fertilizer towards the line conductor, wherein the structure of the bearing assembly 7 for the transmission of the longitudinal shaft associated with the metering spindle shaft assembly 8 separated from the base 9 of the metering assembly ensures correct meshing of the longitudinal gearing 10 with the gearing 11 of the metering shaft, and the separation of the bearings from the metering assembly by means of the rib-cooled motor 12 mounted next to the bearings 13 and to the actuation pinion 14 of the metering spindle 2, the long
