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Microbiology of Soils

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

alfalfa and clover
bean and lupine
soybean
all of these

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Microbiology of Soils
The energy value of biogas is typically

1,000 BTU/ft3
1500 BTU/ft3
more than 5000 BTU/ft3
400-700 BTU/ft3

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Azotobacter
Clostridium
Rhizobium
Beijerinckia

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Microbiology of Soils
Denitrification is carried out

usually by facultative anaerobes
predominantly by Bacillus spp
predominantly by Pseudomonas spp
All of these

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Microbiology of Soils
Degree of compost maturity can be assesed by

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

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

nitrogenase
none of these
nitrate oxidase
nitrate reductase

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