Effets a Long Terme De L’enrichissement Carboné Sur La Tomate De Serre Cultivée Avec Ou Sans Éclairage D’appoint

Tomato (Lycopersicon esculentum Mill. ’Vedettos’) was grown under three different concentrations of atmospheric CO2 (330, 900 and 1500 ppm) and two lighting intensities (natural and natural plus 30 W m−2 (PAR)) provided by high-pressure sodium lights (HPS). Results show a reduction in CO2 efficiency after eight weeks of enrichment. The higher the CO2 concentration, the more serious is this reduction. Our results show the potential of CO2 enrichment and supplementary lighting as well as their synergetic effect on productivity (yield increases of 32, 73 and 122%, respectively). Supplementary lighting does not compensate for the reduction of CO2 efficiency. Concentrations of 900 and 1500 ppm increased the plants’ water-use efficiency.