Fig. 1.

Leaf area (A) and SLA (B) of the youngest fully expanded leaves of I. batatas grown under different light conditions. Means with different letters are statistically different (P < 0.05; n = 5) as determined by LSD multiple comparison test. SL, Sunlight; SL + L-LED, SL with supplemental LED at a PPFD of 150 μmol m⁻² s⁻¹; SL + H-LED, SL with supplemental LED at a PPFD of 300 μmol m⁻² s⁻¹.