With the aim of acquiring a better understanding of ecological growth and biomass of Lablab purpureus and to assess the effect of Bradyrhizobium japonicum strains on the performance of Lablab purpureus and production of Specific biofertilizers in this legume, an experiment was conducted during the February 2012 to May 2013 growing season. Inoculation of Lablab purpureus with Bradyrhizobium japonicum and grew them in a greenhouse for 2 months under varying light (L), phosphorus (P), and nitrogen (N) treatments. I obtained the following results: (1) L, P × N, and L × P × N treatments affected every response variable, but most increases. All the nodulation parameters, namely, nodulation rating, nodule number per plant, nodule volume per plant, and nodule dry weight were significantly influenced by the main effect of Bradyrhizobium japonicum strains alone. The results obtained were analyzed statistically by ANOVA using the software statistica and had shown that the main effect of Lablab purpureus was highly significantly. The yield and the yield components such as number of pods per plant, number of seeds per pod, seed yield, thousand seed weight, above-ground dry biomass, and total nitrogen uptake were highly significantly affected by inoculation of Bradyrhizobium strains alone. A yield increase of 80% was obtained due to inoculation over the uninoculated control. Effect was also significant on number of pods per plant, seed yield, thousand seed weight, harvest index, and total nitrogen uptake. Variety and Bradyrhizobium strain interaction was detected on number of nodules per plant and nodule dry weight