The present study aims to analyze the interaction of prevailing biotic pressure on soil environment with emphasis on its physicochemical and microbiological characteristics determining fertility status of biogenic structures in comparison to soil. The experimental results revealed that the physico-chemical characteristics (viz., pH, C, N, P, K) of midden were higher in comparison to soil. Middens with high N mineralization potential tend to be inherently fertile. Bacterial population increased up to 21st day and there after declined sharply in both midden and soil samples with higher population in the former. Highest microbial count showed a positively significant correlation with enzyme activitiy in earthworm midden. The biogenic structure showed to be beneficial for soil.
