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Microbiology of Soils

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
The crops which are involved in nitrogen fixation are

alfalfa and clover
bean and lupine
all of these
soybean

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

Rhodospirillum
Rhodomicrobium
Thiobacillus thiooxidans
Desulfotomaculum

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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
Assimilative denitrification is done by

prokaryotes
fungi
all of these
plants

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Microbiology of Soils
Degree of compost maturity can be assesed by

both (a) and (b)
None of these
germination test
infrared technique

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