The primary function of nitrogen-fixing bacteria in agriculture is to convert atmospheric nitrogen into a form that plants can utilize, such as ammonium. This process enriches the soil and enhances its fertility, allowing crops to grow more vigorously. These bacteria are crucial for sustainable farming practices, particularly in leguminous crops, which form symbiotic relationships with nitrogen-fixers. By improving soil health and reducing the need for synthetic fertilizers, nitrogen-fixing bacteria contribute to more sustainable agricultural practices, ultimately supporting food security and environmental health.