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Content of nitrate and ammonium in leaf (top) and root (bottom) tissues of Zea mays L. amylacea, after 20 days of treatment with NaCl (0 mM; 100 mM; 430 mM) and H3BO3 (B0, control; B20, 20 mg kg−1; B40, 40 mg kg−1). Values represent the mean ± SE of three independent experiments. Bars with the same letter are not significantly different according to LSD at level of p < 0.05.
