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Microbiology of Soils

Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

60-80
10-20
20-30
30-40

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Azotobacter
Beijerinckia
Clostridium

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Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrogenase
nitrate reductase
none of these
nitrate oxidase

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

slow growth
none of these
fast growth
medium growth

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of bacteria
ingestion of mold
ingestion of fungi
all of these

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

soybean
bean and lupine
all of these
alfalfa and clover

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