Nitrogen is indespensible in nature, it is essential for chlorophyll and amino acids which form proteins. It constitutes main bulk of atmosphere, where it is present in about 78% in ratio. The atmospheric nitrogen is insert and does not readily participate in any reaction. However it is cycled from environment to organisms and back to environment by several paths. Nitrogen is fixed from atmosphere through different sources and is absorbed by the plants in the form of nitrates.
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