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Activities of catalase (CAT) (A), peroxidase (POX) (B), polyphenol oxidase (PPO) (C) and glutathione reductase (GR) (D) as affected by silicon in salt-stressed sweet pepper plants in the 2018 and 2019 seasons. S1: Salinity at 1500 ppm, S2: Salinity at 3000 ppm.
