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

Cyanobacteia
De-nitrifying bacteria
Pectin decomposing bacteria
Nitrifying bacteria

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Microbiology of Soils
Nitrogen fixation

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

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