Fig. 2 Canopy photosynthetic rate (Pn) (A) and photochemical efficiency (Fv/Fm) (B) of Kentucky bluegrass under optimum temperature and well-watered conditions (control), drought (D), heat (H), and the combination of two stresses H+D. Vertical bars indicate LSD values
for treatment comparisons at a given day of treatment. Arrows indicate when plants were rewatered