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Supplementary Lighting and CO2 Mist Influence Rooting of Camellia japonica


Supplementary irradiance from high-pressure sodium lamps (HPS) at 75 μmol·s-1·m-2 stimulated rooting of difficult-to-root Camellia japonica ‘Lady Clare’ when applied from sunrise to sunset in a heavily shaded greenhouse (20% light transmission). There was no effect of HPS on the easy-to-root cultivar Blood of China. Irradiance from HPS either at 45 μmol·s-1·m-2 for 16 hr/day or at 75μmol·s-1·m-2 from sunrise to sunset had little effect on rooting in a 35% transmission greenhouse. CO2 mist inhibited rooting of both cultivars when applied in fall propagation. In spring, CO2 mist during the day stimulated root number of ‘Lady Clare’ when combined with a night-break treatment from incandescent lamps (INC). Carbon dioxide mist had little effect under a natural photoperiod. With ‘Blood of China’, plants under CO2 mist had more roots only under a natural photoperiod, and CO2 mist was ineffective when INC were used. The effects of supplementary CO2, irradiance, and increased photoperiod on rooting varied with season and cultivar.