An agriculturist plants legumes, which host the bacterium Rhizobium in their roots nodules for nitrogen fixation. How will these legumes enrich the soil?

In the root nodules, nitrogen fixation occurs between the bacterium Rhizobium and legumes in a symbiotic relationship. Nitrogen fixation is a process where atmospheric nitrogen is converted into ammonium. Ammonium is a fertilizer for the soil. Therefore, soil is fertilized and enriched.