ABSTRACT
Some experiments had been carried out to trace the effect of salinity, cow waste extract and their interaction on the growth and growth rate of chlorella vulgaris under controlled laboratory conditions. The algal growth decreased with the increase in salinization levels. While the reverse trend was observed regarding the growth response of the lest organism to the different concentrations of the waste extract. Under interactive effects of both salinity and waste extract [as a natural nitrogen source], the maximum concentration of the waste extract [1.4] and the minimum salinity applied [50 mM] supported the maximum growth and growth rate of Chlorella. However, the increasing levels of salinity with waste extract were accompanied by gradually decreasing growth values. The presence of the waste in combination with salinity not only delimits the stress of salinity but also promotes the growth of chlorella. The growth variations of Chlorella under the different treatments were highly significant in most cases as had been evaluated by the F-test