The influence of a number of authenticated strains ofRhizobium melilotion lucerne has been studied. In relation to interaction with three varieties of lucerne it was shown that cwo widely used strains (ML5 and U45) are able to establish equally satisfactory symbiosis on the three genetically diverse lucerne varieties#x2014;Marlborough, Rambler, Glutinosa. Some strains were, however, marc specific in respect to host plant, and a problem exists in securing effective nodulation on the creeping types of lucerne wherein the secondary growth of such plants becomes dissociated from the centre of primary nodulation.
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