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Microbiology of Soils

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

all of these
bean and lupine
alfalfa and clover
soybean

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

all of these
mold mycelium
water
minerals

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

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

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

nitrogen fixation
nitrification
ammonification
denitrification

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Microbiology of Soils
Denitrification may be distinguished as

assimilative
blue baby syndrome
dissimilative
both (a) and (b)

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Microbiology of Soils
The microbial ecosystem of soil includes

biotic components of soil
None of these
biotic and abiotic components of soil
abiotic components of soil

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