Seasonal variation of Phytoplankton density and species richness was studied of Budaki Medium Irrigation Tank. This revealed that the density of phytoplankton was maximum in summer, while it was minimum in winter. Maximum species richness of phytoplankton was recorded in summer, while minimum species richness was recorded in winter. The phytoplankton structure depends on a variety of environmental factors that include various physico-chemical factors. The Pearson correlation was calculated by keeping phytoplankton as dependent variable and other abiotic factors as independent variables.
