A wide variety of nitrogen sources, such as ammonia, nitrate, nitrite and urea, can be used for growing microalgae
 (Becker 1994). In the experimental data, urea and NaNO3 were used to investigate the effect of the source of N and
concentration of NaNO3 (1.5 g l-1, 0.75 g l-1) on the growth of biomass.