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Mean over the 17 week trial for each treatment of 5 parameters of Vallisneria natans roots (means ± SE). (A) biomass, (B) protein content, (C) SOD activity, (D) POD activity and (E) CAT activity. Different letters indicate significant difference at p< 0.05 (determined by mean separation with Bonferroni test). Increasing levels of N-P (in mg·L-1): NP-1, 0.5, 0.05; NP-2, 1.0, 0.1; NP-3, 5.0, 0.5; and NP-4, 10.0, 1.0.
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