When nitrate is used as a source of electron acceptors, there is a net loss of nitrogen from the soil. This process is, therefore, called dissimilatory nitrate reduction, Nitrogen loss by denitrification occurs during seasonal flooding of the land, or as a result of over-irrigation of poorly drained land.
Lack of fertility of constantly wet soils is due to the growth of nitrate reducing anaerobic species.Some of these organisms are Thiobacillus denitrificans, Micrococcus denitrificans, various species of Clostridium and some species of Serratia, Pseudomonas and Achro mobacter.
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