Abstract
Cross-inoculation relationships were established for 41 leguminous plant spp. in 14 genera. 23 spp. of Crotalaria and 8 spp. of other genera were placed in the cowpea cross-inoculation group.Irregularities in nodule-forming power were noted with different strains of nodule bacteria isolated from various spp. within the cowpea group of hosts. Media for cultivating nodule bacteria were improved by addition of asparagus extract.

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