Abstract
Abstract High-pressure sodium (HPS) lamps were as effective as incandescent (INC) lamps for controlling photoperiod with 10 cultivars of Chrysanthemum × morifolium Ramat. for up to 8 weeks when used at illuminances (108 to 215 lux) generally recommended. Two garden cultivars studied initiated flowering under long days (LD) with both lamps. In a second study, 11 chrysanthemum cultivars were grown under continuous irradiation from HPS lamps. Six cultivars were vegetative after 8 weeks; the other 5 cultivars developed crown buds or lost apical dominance.
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