An association or associations of farmers engaged in multiplying and certifying seed or plant parts of a superior variety or strain of plants or crops, such as those bred and tested or tested only by the Agricultural Experiment Station of Auburn University, and in increasing breeder seed by producing, processing and distributing foundation seed may adopt a symbol or symbols of identification or certification of such seed or plant parts and such foundation seed and, upon approval of the director of such experiment station and of the Director of the Extension Service of Auburn University, register same with the state Commissioner of Agriculture and Industries. Only one such association may so register such a symbol or symbols for any one specified crop.