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The impact of LED light spectrum on (A) plant height (cm); (B) plant fresh weight (g); (C) number of leaves; (D) plant fresh weight (g); (E) leaf area (cm2) and (F) stalk height (cm) of green lettuce (Locarno variety) at three developmental stages, 15, 30 and 45 days from transplanting in the plant factory. Letters indicate significant differences (p< 0.05) between treatments within each experiment (* refers to the interaction between treatments).
