The process by which bacteria convert nitrogen gas into ammonia is known as nitrogen fixation. This biological process is primarily conducted by certain bacteria, often found in the root nodules of legumes. Nitrogen fixation is critical for converting atmospheric nitrogen, which most organisms cannot utilize, into ammonia, a form that can be absorbed by plants. This transformation is vital for ecosystem functioning, supporting plant growth and nutrient cycling. Understanding nitrogen fixation is important in agricultural practices to enhance soil fertility and improve crop yields through sustainable practices.