Soil microflora
Activities of soil microbes is often measured in terms of the amount of
oxygen absorbed or amount of Co2 evolved by the organisms in the soil environment. Under
high soil moisture level / water logged conditions, gaseous exchange is hindered and the
accumulation of Co4 occurs in soil air which is toxic to microbes. Depending upon oxygen
requirements, soil microorganisms are grouped into categories viz aerobic (require oxygen for
like processes), anaerobic (do not require oxygen) and microaerophilic (requiring low
concentration / level of oxygen).
6. Light: Direct sunlight is highly injurious to most of the microorganisms except algae.
Therefore upper portion of the surface soil a centimeter or less is usually sterile or devoid of
microorganisms. Effect of sunlight is due to heating and increase in temperature (More than
45°)
7. Soil Reaction / Soil PH: Soil reaction has a definite influence / effect on quantitative and
qualitative composite on of soil microbes
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