Fig. 2
The effect of high-nitrogen and -potassium fertilizers on the Pn (A), Ci (B), gs (C), Tr (D), VPD (E), and WUE (F) of Hosta ‘Guacamole’ under drought stress. Each value is expressed as the mean ± SE of 9 independent plants. Different lowercase letters represent significant differences between treatments (P < 0.05)