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During the autumn/spring “off” season, yield and quality of tomatoes are often affected by insufficient CO 2  and low light in greenhouse production. Although tomato is one of the most widely cultivated vegetables, few studies have investigated the interactive effects of supplementary light and CO 2  enrichment on its growth, photosynthesis, yield, and fruit quality in greenhouse production. This study investigates the effects of supplementary light (200 ± 20 μmol·m –2 ·s –1 ) and CO 2  enrichment (increases to about 800 μmol·mol –1 ), independently and in combination, on these parameters in autumn through spring tomato production. Compared with tomatoes grown under ambient CO 2  concentrations and no supplementary light (CaLn), supplementary light (CaLs) and supplementary light and CO 2  enrichment (CeLs) significantly promoted growth and dry weight accumulation. Meanwhile, CO 2  enrichment (CeLn) and CaLs significantly improved photosynthetic pigment contents and net photosynthetic (Pn) rates, whereas CeLs further improved these and also increased water use efficiency (WUE). CeLn, CaLs, and CeLs significantly increased single fruit weight by 16.2%, 28.9%, and 36.6%, and yield per plant by 19.0%, 35.6%, and 60.8%, respectively. The effect of supplementary light on these parameters was superior to that of CO 2  enrichment. In addition, CaLs and CeLs improved nutritional quality significantly. Taken together, CeLs promoted the greatest yield, WUE, and fruit quality, suggesting it may be a worthwhile practice for off-season tomato cultivation.

hortscience

Interaction of Supplementary Light and CO2 Enrichment Improves Growth, Photosynthesis, Yield, and Quality of Tomato in Autumn through Spring Greenhouse Production