Abstract
Abstract Supplementary night lighting (2000 HR to 0400 HR) from low-irradiance incandescent lamps (INC) stimulated rooting in Rhododendron ‘Unique’ and increased root-ball diameter of ‘Unique’ and ‘Anna Rose Whitney’ in both spring (Feb.–June) and fall (Sept.–Jan.) propagation. Increasing irradiance during the day with supplementary high-pressure sodium lamps (HPS) during fall propagation inhibited initial root development of ‘Unique’ but stimulated subsequent root growth of both ‘Unique’ and ‘Anna Rose Whitney’. In spring, HPS stimulated root growth in ‘Unique’ but had little effect on ‘Anna Rose Whitney’. Increased irradiance from HPS does not appear necessary for rooting rhododendrons under greenhouse conditions and may be detrimental in the early stages of propagation, especially when natural radiation levels are high.
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