Earthworm is an important factor to influence the physical feature of soil and microbial activities. Soil organic matter is a key factor for sustainable soil fertility. A good combination of soil components: earthworms, physical factors, chemical factors and microbial factors are essential for sustainability of soil fertility and environment. Bangladesh is a natural resource enriched promising delta. The weather and climate, geographical settings and environment have added more opportunity for the biodiversity as a harboring point. Recently there has been considerable interest in using...