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Abstract The present investigation aimed to: 1- study the response of rice plant to inoculation with a mixture of blue-green algae (BGA) strains under salinized soils. 2- explore and maximize the various benefits of the potential interaction effects between NPK-cofertilization and BGA-biofertilization in order to reduce the harmful impacts of high salts levels by regulating osmoses in plants due to improving soil properties. 3- optimize these potential interaction effects between K-cofertilization and BGAbiofertilization to improve yield quality and quantity through enhancing non-symbiotic N2-fixation in salt afTected soil. 4- reduces or replaces the environmental hazardous impacts of the added NPK-mineral fertilization. 5- maximizes utilization of different BGA-microbial inocula to improve soil fertility and its chemical characteristics and productivity under different salinity conditions. The present investigation was conducted d~uing the growing summer successive seasons 9511996 and 9611997 under wire proof greenhouse conditions, using cylindrical perforated plastic pots of (32 cm internal diameter x 35 cm height and their cross section 805 cm2) containing 12 kg treated soils on oven dry weight basis, at Sakha Biofertilizers Station, Kaf? El-Sheikh, General Organization of Agricultural Equalization Fund (G. 0. A. E. F.), Ministry of Agriculture. |