The experiments were repeated for two consecutive years to establish the reproducibility of the results. All plants in three pots for each treatment were uprooted 50 and 80 days after seeding (DAS) and nodulation was recorded. Nodules were quantified, dried at 80 _C, and weighed. Plants removed at 50 and 80 DAS were ovendried at (80 _C) and dry biomass was measured.