Moisture, pH, depth and carbondioxide evolution were observed to be some of the major contributing factors influencing the microbial population in red and black soils. Path analysis revealed that the net contribution of pH and depth was negative and moisture and carbondioxide evolution positive. The effect of pH was mostly indirect via depth in black soil and direct in red soil. The contribution of moisture was direct in both the soils. The direct effect of CO, was low and negative in both soils. Depth had a direct negative influence on population in both soils.
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