Thiobacillus is a group of bacteria helpful in carrying out:

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Thiobacillus denitrificans, Micrococcus denitrificans , and some species of Serratia, Pseudomonas, and Achromobacter are implicated as denitrifiers. Pseudomonas aeruginosa can, under anaerobic conditions (as in swampy or water-logged soils), reduce the amount of fixed nitrogen (as fertilizer) by up to 50 percent.