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Nitrogen Cycle 1: Legumes

A global cycle represents the path of an element as it moves through the spheres of the Earth – the biosphere, lithosphere, hydrosphere and atmosphere. An example of this is the nitrogen cycle. Nitrogen (N) is an essential element for plant growth, forming the structure of DNA and amino acids. While there is an abundance of nitrogen gas (N 2 ) in the atmosphere, in this form it is not available for plant uptake and must be converted into nitrate (NH 3 ) before it can be used. The nitrogen cycle demonstrates the conversion of nitrogen gas to nitrate. Nitrogen cycle Legumes Legumes Follow the path of nitrogen in the nitrogen cycle to find the nitrogen-fixing bacteria. These bacteria convert the N 2 in the atmosphere into nitrate, making it available for plant uptake. Some of these bacteria form a symbiotic relationship with plants called legumes. The bacteria live in nodules on the legume plant roots and harvest the atmospheric nitrogen, making it immediately available for

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