Nitrogen fixation is the process by which certain bacteria, often living in symbiosis with leguminous plants, convert atmospheric nitrogen (N?) into a form that plants can use, such as ammonia (NH?). This biological process is essential for adding nitrogen to the soil, a critical nutrient for plant growth. Nitrogen-fixing bacteria, such as Rhizobium, form nodules on the roots of legumes, providing a natural source of nitrogen and reducing the need for synthetic fertilizers.
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