Fig. 3

The effect of high-nitrogen and potassium fertilizers on the ΦPS II (A), ETR (B), qP (C), and NPQ (D) in Hosta ‘Guacamole’ under drought stress. Each value is expressed as the mean ± SE of 3 independent plants, and each treatment was repeated four times. Different lowercase letters represent significant differences between treatments (P < 0.05)