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Denitrification is the process of nitrate reduction which results in the release of nitrogen back in to the atmosphere. Here the nitrite or nitrate is reduced into nitric oxide, nitrous oxide and molecular nitrogen. Denitrification is the reverse process of nitrogen fixation which replenishes the nitrogen present in the atmosphere. This denitrification process is brought about by the denitrifying bacteria’s e.g. Pseudomonas.

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