What happens inside the nodule to help legume plants grow in soil lacking nitrate ions?

Inside the root nodules of legume plants, specialized bacteria known as rhizobia convert atmospheric nitrogen (N₂) into ammonia (NH₃) through a process called nitrogen fixation. This ammonia is then assimilated by the plant to produce amino acids and other essential compounds, enabling it to thrive in nitrogen-poor soils. The plant provides carbohydrates and a suitable environment for the rhizobia, creating a symbiotic relationship that enhances nutrient availability and promotes growth. This mutualistic interaction allows legumes to flourish even in conditions where nitrate ions are scarce.