Genetic diversity of indigenous Bradyrhizobium nodulating promiscuous soybean [Glycine max (L) Merr.] varieties in Kenya: Impact of phosphorus and lime fertilization in two contrasting sites - Wasike, Victor W.; Lesueur, Didier; Wachira, F.N.; Mungai, NW; Mumera, LM; Sanginga, Nteranya; Mburugu, HN; Mugadi, D; Wango, P; Vanlauwe, Bernard (Springer, 2009)