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What is Nitrogen Cycle ?

Nitrogen is present in the atmosphere as N2 in large amounts (78%). The nitrogen is present in all biotic components in different forms as food.
                  



Examples - Proteins, Vitamins , amino acids , etc. , 

N2 from the atmosphere is taken up by the green plants as a raw material for bio synthesis of different foods (amino acids, proteins, vitamins) and used in metabolism. These food move through the food chain. After death of the plants and animals, the organic nitrogen in dead tissues is decomposed by several micro organisms. (ammonifying and nitrifying bacteria) into ammonia , nitrites and nitrates, which are again used by the plants. Some bacteria convert nitrates into molecular nitrogen (N2), which is again realeased back into atmosphere and the cycle goes on.




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