Abstract
Roots of winged beans (Psophocarpus tetragonolobus) were found to possess greater numbers of nodules and heavier dry weights of nodules than other legumes when not inoculated and grown in an Oxisol with no previous history of legume cultivation. Promiscuous nodulation of winged beans appears to follow an exponential growth pattern for nodule dry weight and a linear growth pattern for nodule number. Promiscuous nodulation was much greater on some genotypes than on others when genotypic mean are compared. On an individual plant basis, heritabilities for promiscuous nodulation are very low.
