Effect of different concentration of ST (A), L-NAME (B), DPI (C) and SNP D) on seedling dry weight at 72 h after imbibition at 25°C of untreated control (UT) and magnetically treated (MT) Maize seeds. Vertical line above the bar indicates ± SEM. ***, ** and * indicate significance at P < 0.001, 0.01, and 0.05, respectively, compared with control (UT) and ###, ## and # indicate significance at P < 0.001, 0.01, and 0.05, respectively, compared with magnetically treated (MT) seed. Non-significant terms are not shown.