Influence du mode d'utilisation de l'éclairage d'appoint sur la productivité et la physiologie de la tomate de serre

Abstract

Tomato plants (Lycopersicon esculentum 'Vedettos') were submitted to 10 light treatments obtained by modifying the supplemental photosynthetic photon flux (FPP) (0, 100, 150 μmol m−2 s−1), the photoperiod (natural, 14 h, 17 h, 20 h, 24 h) and the light distribution mode (one or two dark periods). Supplemental light was supplied by high-pressure vapor sodium lamps (HPS). Our results showed that supplemental lighting at a level of 150 μmol m−2 s−1 (PAR) helped to maintain a weekly yield of over 1 kg m−2 during November, December and January. Prolongation of the photoperiod over 14 h did not increase the yield. Plants exposed to continuous lighting were damaged even if they had been previously exposed to long photoperiods (17 and 20 h). For photoperiods of 17 and 20 h, lighting during the night which generated two dark periods per day damaged the plants and reduced the yields. Key words: Tomato (Lycopersicon esculentum), greenhouse, supplemental lighting, continuous lighting, yield, physiological disorders