This device is characterised in that it comprises a tank 3 of appropriate capacity, containing the liquid product used for the processing, a container 4 supplied with processing product, from the tank 3, which constitutes a buffer container from which the processing product is dispensed according to an adjustable flow rate by the intermediary of a nozzle 11 to a load of seeds to be coated contained in a coating device which is known per se. Application to the processing of seeds by coating in cooperation with known means. <IMAGE>
