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Food grain production to meet the dietary requirement of ever increasing Indian population. Some
of the algae and bacteria have capable to fixation of atmospheric nitrogen to ammonia, which are
some from BGA members. During this present investigation out of total 25 taxa of Cyanophyceae 14
species and 8 families, Chlorophyceae belonging to 10 where, Chlorellaceae represent
cladophoraceae 2 species, desmidaceae 1 species, following Oedogoniaceae 1 species
Zygnemataceae have been found with 2 species, 2species from Characeae etc.1species from
naviculaceae under class of Bacillariophyceae. Cosmarium, species were high, observed during the
period of August to October, during these months the water level declined gradually in rice field. It
was found that population of algae belongs to above mentioned order were less in number during
advent of summer month.
Key words: N,-fixing, Blue-Green Algae, Rice Fields, Chemical Fertilizers