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Fixed vs. variable light quality in vertical farming: Impacts on vegetative growth and nutritional quality of lettuce

Fig 5

Representative green romaine lettuce plants from different light treatments.

(a). low blue or L, (b). low to high blue or LH, (c). high blue or H, and (d). high to low blue or HL.

doi: https://doi.org/10.1371/journal.pone.0285180.g005