Question

What are the differences between Azotobacter and Rhizobium Bacteria if both of them provide nitroginic soluble form in the soil?

Answer 1

Azotobacter is a free living nitrogen fixing bacteria in the soil.
Rhizobium is a symbiotic bacteria forming mutual beneficial association with the plants. The bacteria obtain food and shelter from plants. In return, the bacteria give a part of their fixed nitrogen to the plants. It forms nodules on the roots of legume plants.