Effets À Long Terme De L’enrichissement Carboné Et D’un Appoint De Lumière Sur La Productivité De La Rose Cultivée en Serre

Roses (Rosa hybrida ’Royalty’) were grown at atmospheric CO2 concentrations of 330, 900 or 1500 ppm with or without supplemental lighting of 50 μmol m−2s−1 (PAR) provided by high pressure sodium lamps (HPS). Supplementary lighting and CO2 enrichment increased total yields of marketable flowers by 34 and 26%, respectively, compared with the control plants (natural lighting and CO2 concentration conditions). The combined effects of these treatments increased yield by 69% compared with the control. Improved flower quality and shortened production cycles were also observed. Flower stem length and diameter were not significantly affected by the treatments. The increased production levels obtained with CO2 enrichment and supplementary lighting were maintained throughout the treatment and post-treatment periods. These results indicate that rose plants respond positively to long-term CO2 enrichment and show beneficial residual effects to the treatments.