This study, conducted at the College of Agriculture and Marshlands, Thi-Qar University, commenced during the 2019–2020 season on 36 three-year-old offshoots of date palm (Phoenix dactylifera L.) cultivar Lulu, produced from tissue culture. The research aimed to know the impact of Calmax and Stimplex and their interactions on the leaf contents of flavonoids, glutathione, vitamin C, and the superoxide dismutase enzyme. The results showed the significant superiority of the Calmax treatment at a concentration of 4 ml L^-1, recording the highest averages (11.61 mg g^-1, 12.42 μmol g^-1, 1.50 mg g^-1, and 14.06 unit g^-1 f.w.), respectively, compared with the control treatment. The Stimplex treatment at a concentration of 12 ml L^-1 showed notable superiority, with maximum averages of 13.30 mg g^-1, 13.02 μmol g^-1, 1.55 mg g^-1, and 16.61 unit g^-1 f.w., respectively, versus the control treatment. The interaction treatment between Calmax at a concentration of 4 ml L^-1 and Stimplex at a concentration of 12 ml L^-1 revealed remarkable differences. The highest averages for flavonoids, glutathione, vitamin C, and the superoxide dismutase enzyme emerged at 13.94 mg g^-1, 13.56 μmol g^-1, 1.66 mg g^-1, and 18.45 unit g^-1 f.w., respectively, compared with the control treatment.

Keywords: Date palm (P. dactylifera L.), Calmax, flavonoids, glutathione, Stimplex, vitamin C

Key findings: A significant increase was evident in the leaf content (antioxidants flavonoids, glutathione, vitamin C, and superoxide dismutase enzyme) of the date palm (P. dactylifera L.) cultivar Lulu due to foliar application of Calmax (4 ml L^-1) and Stimplex (12 ml L^-1) and their interaction.