How do legumes and nitrogen-fixing bacteria co-exist and describe the nitrogen biogeochemical cycle?
In reference to the rhizobium bacteria on the root that produces the nitrogen. Rather roots provide color of pigment.
Legumes are pod bearing plants that have the notable abiltiy to secure nitrogen from the ambient atmosphere and fix it into the soil by the use of rhizobium bacteria that coexist on the legumes roots. This is an invaluable resource in restoring depleted nitrogen supplies to crop-producing soils. The rhizobium bacteria exist in nodules on the roots of legumes, and are known as nitrogen-fixing bacteria. Nitrogen is an important nutrient to plant nutrition and the production of crops from the plants. Normally, nitrogen is placed into the soil by the use of artificailly produced fertilizers that have ammonia as a principle ingredient, NH3. So the planting of legumes as a form of established crop rotation is instrumental in replacing the depleted nitrogen supplies of farm land. This is a part of the nitrogen cycle that takes nitrogen from the atmosphere, fixes it into plant structure, then is recycled back into the atmosphere when the plants are digested or die and decompose back into the base constituents that make up the plants, such as nitrogen.