Fig. 4

Effect of different levels of melatonin on TPC (a), TFC (b) and antioxidant activity (c) of Thymus vulgaris under different irrigation regimes. The mean comparisons were performed using the LSD test at P ≤ 0.05 significant level. Data are presented as means ± SE (n = 3). Means followed by the same letter(s) are not significantly different