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Effects of silicon (Si, 1 mM) on photosynthetic rate (a), stomatal conductance (b) and transpiration rate (c) of sorghum plants grown under control (3 mM KCl) and low K (0.05 mM KCl) conditions. All parameters were measured after 15 days of treatment. Values are presented as the mean ± SE (n = 6). Different letters in one measure indicate statistically significant differences at P < 0.05.
