Two field experiments were laid out at El-Sirw Agricultural Research Station, (ARC), Damietta Governorate, Egypt, during two successive seasons of 2008 and 2009 to study the effect of some rates, dates and methods of potassium application on growth ( dry mater, leaf area index (LAI) and chlorophyll content) and tillers number/m², panicle numbers/m², plant height, panicle length, No. of filled grains /panicle, panicle weight and grain yield (t/fed) of some rice genotypes under saline soil conditions. The potassium treatments were; T₁ ( Control), T_{2   (}12 kg K₂O as basal (B)) , T₃  (12kg K₂O as B + 12kg K₂Oas B at 60 days after transplanting(DAT)) , T₄  (24 kg K₂O as B ), T₅ (24 kg K₂O asB+ 12 kg K₂O at 60 DAT), T₆  (2% as spray at 30DAT ), T₇  (2% as spray at 60 DAT),  T₈ ( 2% as spray at 30DAT + 2% as spray at 60DAT), T₉  (12kg K₂O as basal + 2% as spray at 30 DAT ), T₁₀  (12 kg K₂O as basal  + 2% as spray at 60  DAT), T₁₁  (24 kg K₂O as basal + 2% as spray at 30 DAT) and  T₁₂   (24 kg K₂O as basal + 2% as spray at 60 DAT). Two rice genotypes viz;(EHR1) hybrid and the local inbred Giza178 were used in the present study                 The main obtained results could be summarized as following. Rice genotypes significantly varied in their growth traits, yield components and grain yield. Hybrid rice  (EHR1) variety significantly surpassed Giza178 rice cultivar. The potassium treatments significantly affected rice growth, yield and yield components in both seasons. Rice response to potassium fertilizer significantly was up  to  24 kg K₂O as basal + 2% as spray at 60  DAT, which gave high values of all studied traits.                 Egyptian hybrid one EHR1 with 24 kg K₂O as basal + 2% as foliar spray at 60 DAT gave high values of estimated growth parameters, yield components and grain yield under current study.                 It could be concluded  that the treatment of 24 kg K₂O/ fad applied as basal +2% as foliar spray at 60 DAT could be recommended under saline soils condition .