Fig. 6

Effect of caffeic acid (CA), cobalt sulfate (CoSO₄), and nanoparticle coated urea (NPCU) on CAT (A), proline content (B) and SOD (C) concentration of leaves of potatoes. The Tukey test measured significant differences (p ≤ 0.05); distinct letters on the bars are the mean of four replicates ± SE.