Production of Chrysanthemum Cuttings under Supplementary Lighting and C02 Enrichment

Abstract

Abstract Stock plants of Chrysanthemum morifolium Ramat. cv. Dramatic were grown in clear plastic chambers within a greenhouse to study the effects of CO2 enrichment at a commercial level (1375 ppm) and supplementary high pressure sodium (HPS) lighting on yield and quality of cuttings. Based on increases in the number of cuttings, stem length, leaf area, fresh weight, and dry weight, CO2 enrichment during the day period was beneficial, regardless of the use of HPS lighting. When HPS lighting was used for 24 hours, the most effective time to add C02 was during the day because the low light level of 60 µmol s−1m−2 provided solely by the lamps was insufficient to make night CO2 enrichment a beneficial practice.