This page discusses symbiotic nitrogen fixation in leguminous plants through their association with nitrogen-fixing bacteria, mainly Rhizobium. This mutualism benefits both parties, with Rhizobia need...This page discusses symbiotic nitrogen fixation in leguminous plants through their association with nitrogen-fixing bacteria, mainly Rhizobium. This mutualism benefits both parties, with Rhizobia needing legumes for nitrogen fixation, while legumes gain autonomy from soil nitrogen. The process involves Rhizobia invading legume roots and forming root nodules for nitrogen fixation, requiring factors like leghemoglobin and molybdenum.