Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Rhodomicrobium
Rhodospirillum
Thiobacillus thiooxidans
Desulfotomaculum

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Microbiology of Soils
Nitrogen fixation

changes the free nitrogen (N2) to a form usable by plants
especially changes nitrogen compounds, mostly amines such as NH2
both (a) and (b)
fix the free nitrogen (N2) by which it should not be usable by plants

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