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«Karls» and «Rosana», two Boston-type lettuce (Lactuca saliva L.) cultivars, were subjected to various light treatments in greenhouses equipped with one of two propane heating systems. Photoperiods of 16, 20, 24, or 24 hours for 2 weeks after transplanting and then 16 hours (2416) and photosynthetic photon flux of 50 or 100 μmol.m -2 .s -1 provided by supplementary lighting (high-pressure sodium vapor lamps) were compared to natural light during four experiments performed in greenhouses between Sept. 1989 and May 1990. Using supplementary lighting resulted in significant increases in biomass (≤270%),head firmness, and tipburn incidence and decreases in production cycle length (≃30%)

Photoperiod and Photosynthetic Photon Flux Influence Growth and Quality of Greenhouse-grown Lettuce