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Two contrasting cultivars of barley(Hordeum vulgare L.):Kepin No.7(salt sensitive),and Jian 4(salt tolerant)were grown in a hydropon ics system with 2 NaCl levels:60 mmol NaCl L^-1 and 120 mmol NaCl L^-1 ,and 3 Si levels:0 mmol Si L^-1 ,0.5 mmol Si L^-1