Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Pectin decomposing bacteria
De-nitrifying bacteria
Cyanobacteia
Nitrifying bacteria

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Microbiology of Soils
Nitrogen fixation

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

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