Plant growth promoters were estimated in three cyanobacterial strains (Anabaena azollae Strasburger, Spirulina platensis Geitler and Nostoc muscorum C. Agardh  in the presence of potassium nitrate, sodium chloride and tryptophan, with different concentrations. The highest concentrations of IAA and GA₃ were determined and applied to Maize that was planted in soil with EC (5.4). Cyanobacterial treatments were applied three times throughout the cultivation period of Maize. Mineral fertilization was applied according to the guidelines of the Egyptian Ministry of Agriculture, with 100% to control, and 75% to all other treatments. Final results showed that the highest yield was obtained by treating Maize with (Spirulina platensis with tryptophan, Anabaena azollae with both potassium nitrate and tryptophan) respectively. Those results were almost three times more than the control yield. It`s recommended for the yield improvement; to use the selected strains, especially in sandy and saline soils.