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Water salinity is a limiting factor stressed plants and associated with low wheat productivity in new reclaimed areas in Egypt such as North Sinai. Sea water is available water resources and renewable and non-exploited, it is necessary to maximize use of this water through scientific research for use in irrigation of wheat, to increase the cultivated area and thus, increase production towards self-sufficiency. So, two field experiments were carried out at Faculty of Environmental Agricultural Sciences, EIArish, Suez Canal University, during 2012/2013 and 2013/2014 seasons aiming to investigate the response of three wheat cultivar (Triticum aestivum. L.; Masr1, Masr2, Sakha93) to four mixing ratios between well-water and sea water (control, 3:1, 2:1 and 1:1). Plants were subjected to salinity treatments at 60 days after sowing (DAS). Results showed that Masr2 and Masr1cvs were superior for yield and its attributes, the superiority was obtained from Masr2 cv as well as seed content of proline and protein. Also, dry leaf content of Na and Cl were higher for Masr2 as compared to the other studied cultivars under low mixing ratio (3:1 Well water: Sea water), while, the K concentration was decreased with the same treatment of Masr2. For soil analysis, EC, Na , Mg, K, HCO3 -2 and Cl increased but Ca decreased under the highest mixing ratio (1 Well water: 1 Sea water). So, it could be recommended to cultivate Masr2 wheat cultivar under North Sinai conditions, using mixing ratio 3 Well water : 1 Sea water to maximize the benefit of sea water and gain economic productivity of bread wheat in this area and similar regions.

RESPONSE OF SOME BREAD WHEAT CULTIVARS TO SALINITY STRESS BY RE-USE OF SEA WATER UNDER NORTH SINAI CONDITIONS