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In India no serious attempts have been made so far for the ecological behavior soil microarthropods in habiting in three distinct cultivated fields in East Midnapore district. This monograph has been designed to investigate the diversity, species composition, density, distribution and seasonal population structure of microarthropods with special reference to collembolan community inhabiting different cultivated sites in relation to edaphic factors and to workout species richness index, species diversity index, group diversity index, evenness index etc.