Abstract
ABSTRACT LETTUCE (Lactuca sativa L.) and radish (Raphanus sativus L.) plants were grown under various light in-tensities and photoperiods to determine the pattern of light treatments that could induce the most growth of these plants with the least input of light energy. Max-imum plant growth per unit input of light energy oc-curred under low light intensities and long photoperiods. Although these conditions are not normally observed in the field, controlled environment facilities can be man-aged to provide specific light environments. Results sug-gest the feasibility of preprogramming light energy input for maximization of plant growth on a per unit energy cost.
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