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Two field experiments were conducted under saline soil during 2013 and 2014 seasons at Research Farm of El Sirw Agricultural Research Station, Damietta province, Egypt. Improving salinity tolerance and grain yield of hybrid rice were the main objectives of the current study. The experimental soil was clayey with salinity levels of 7.70 and 7.30 dS/m in 2013 and 2014 seasons, respectively. Egyptian hybrid rice one (EHR1) variety was used in this study. The studied treatments were including; water (spray control treatment), GA3 with concentration (5, 10, 15 ppm), Auxin with concentration (5, 10, 15 ppm), Cytokinin with concentration (5, 10, 15 ppm). Those substances were sprayed at mid tillering, panicle initiation and booing stage. At heading the growth parameters of EHR1 was measured at heading stage as well as plant chemical contents were estimated. Grain yield and its components were estimated at harvest. The factorial design was used in the experiment with three replications. The obtained results showed that foliar spray treatments were found to be increased effective in enhancing growth plants of EHR1 and increased nutrient leaf content such as N and K. therefore, the salinity withstanding of EHR1 was raised resulted in proper growth and reasonable grain yield under salt stress. Applying Cytokinin or Auxin at 10 ppm as foliar application was most effective treatment in improving rice productivity under salt affective soils.

Effect of Plant Growth Regulators on Growth and Yield of Egyptian Hybrid Rice One Under Saline Soil Conditions