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Stomatal conductance (gs), leaf photosynthesis (An), and intrinsic water use efficiency (WUEi) of wheat leaves as treated by (control, salicylic acid, biochar, and SA + biochar) under different three irrigation conditions (50%, 70%, and 90% DAM) in saline sodic soil. Error bars indicate ± SE (n = 3). SE indicates standard error. Mean values designed by the same letter in each column are not significant according to Tukey’s multiple range test. ** denote significance at P < 0.01.
