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ROS reactive oxygen species (UF) in new leaf of cucumber plants under different Fe treatments [21 days of Fe sufficiency (+Fe), 10 days of sufficiency + 7 days of Fe deficiency (−Fe) and 5 days more of refertilization with 57Fe (+FeR)] and Si treatments [Si applied to root (+SiR), leaves (+SiF), and no Si (−Si) application]. The data are the mean ± SE (n = 3). Different letters in the same row showed significant differences according to Duncan’s test (p < 0.05).
