Nitrogen cycle
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Nitrogen gas in the air is converted into usable forms by soil bacteria through a process called nitrogen fixation. Plants then take up these forms of nitrogen from the soil. When organisms consume plants, they obtain nitrogen from the plants, and the nitrogen cycles through the food chain as organisms are consumed by other organisms.
The nitrogen cycle is the process by which nitrogen moves through the environment. Nitrogen gas in the air is converted into a form that plants can use by bacteria in the soil. Plants then take up this nitrogen to grow. When plants and animals die, bacteria break down their remains, releasing nitrogen back into the soil. This cycle continues as nitrogen is recycled between the air, soil, plants, and animals.
Plants can obtain nitrogen from the soil through their roots. They form symbiotic relationships with nitrogen-fixing bacteria in the soil, which convert atmospheric nitrogen into a form that plants can use. Additionally, decaying organic matter in the soil releases nitrogen that plants can absorb.
A number microbes in the soil, water and air transform these nitrogen compounds
Farmers grow leguminous crops between other plants to improve soil fertility through nitrogen fixation. Legumes have a symbiotic relationship with nitrogen-fixing bacteria in their roots, which can enrich the soil with nitrogen that benefits neighboring plants. This practice is known as crop rotation and helps maintain soil health and productivity.
Because leguminous plants are capable of fixing free nitrogen from the air with help of their root nodules. Thus soil get rich in nitrates in those places where these plants are grown.