الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
Isolation and purification of cyanobacteria dominated in the soil samples collected from different sites in Kafr El- Sheikh, and El-Dkahlia governorates isolates were successfully obtained as bacterial free cyanobacteria. They were identified according to Thallus color, thallus morphology and dimension, size of heterocyst, vegetative and reproductive cells. Heterocyst-forming cyanobacteria were also cultured as Anabaena sp., Nostoc sp., Oscillatoria sp and chroococcus sp., as the most of cyanobacteria , which were associated with other microorganisms, so, these must be purified from any contaminants, they exposed to different trials of purification. However, washing, Ultra violet irradiation and mercuric chloride treatments were the most effective method for obtaining cyanobacteria cultures free from bacteria, while the other methods gave some success for killing bacteria in one side and some failure in the other side, which could be lethal for cyanobacteria themselves. The results of this translational research indicate that environmentally friendly biofertilizer inoculants can be recommended (with sufficient supporting data) to improve agriculture economy and sustainable agro-ecosystem maintenance of increased rice production where the benefits of such biotechnology are most urgently needed. The biofertilization practice expressed in this study its potentiality to improve rice growth and performance even when the farmers followed the recommendation provided by the national agricultural authorities. Typically, the farmer’s practice would include mistakes such as poor field leveling, irregular transplantation with some unused land areas, no inoculation, and application of excessive quantities of N-fertilizers, improper timing of their application, uneven distribution of the fertilizer in the field area, improper or insufficient pest management practices, insufficient or excessive supplement of irrigation water and/or inefficient drainage system. This study has been performed in farmers fields enable them and the landowners to see, “life and in full color”, the benefits of the biofertilization technology.