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Egypt. J. Phycol.. 2018; 19(1): 1-22

Production of Algal Growth Promoters And Studying Their Effects on Maize Crop

Eman Mostafa Maarouf, Ahmed Abdel Rahman El Awamri, Reda Al Shahat, Azza Abdel Aal.

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 Anabaena azollae with 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.

Key words: Cyanobacterial hormones, IAA, GA3, Maize, Anabaena azollae, Spirulina platensis, Nostoc muscorum, KNO3, NaCl and Tryptophan, EC.

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