Water stress influences the performance of legume crops. Soybean, mungbean and Bambara groundnut plants in the control plots produced the highest; 34.3, 3.7 and 50.0,mean number of nodules, respectively at flowering stage and these were significantly different at p>0.05 from the mean number of nodules obtained in the legume plants that received measured water treatments. Also the percentage nitrogen fixed by each of the legume crops in the control plots, 11.4%, 21.7% and 33.5% for soybean, mungbean and Bambara groundnut, respectively, were significantly different at 5% level of probability from the legume plants treated with 500ml of water once daily. It was observed that, inspite of the water stress condition faced by the three legume crops, Bambara groundnut fixed the highest nitrogen, 33.5% in the control plots, and 17.7% in the 500ml of water one in 4 days plots, than in the corresponding treatments for soybean and mungbean. It was therefore, concluded that water stress conditions affect nodulation of nitrogen fixation in the selected legume crops. Bambara groundnut can be used as nitrogen fixing legume crop in soils with low nitrogen level, where water is a limiting factor.