Publication | Open Access
Effect of Photoperiod and High Intensity Supplementary Lighting on Flowering of Alstroemeria ‘Orchid’ and ‘Regina’
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1983
Year
BiologyHigh-pressure SodiumLight RegulationHealth SciencesBotanyNatural SciencesEvolutionary BiologyPlant ReproductionAbstract Alstroemeria Plants‘ Regina ’Flower StemsHorticultural PlantPhotosynthesisPlant PhysiologyPlant Development
Abstract Alstroemeria plants were grown under 10, 12, 14, 16, 18, and 24 hour photoperiods by employing an 8-hour natural day and low intensity incandescent lighting as a daylength extension. The production of flower stems was increased to a maximal level by extending the photoperiod to 16 hours in ‘Orchid’ and in ‘Regina’. Under 16 hours high-intensity supplementary lighting with high-pressure sodium (HPS) lamps, the production of flower stems in ‘Orchid’ increased by 49% in the first year and 36% in the 2nd year. ‘Regina’ flower stems increased by 26% in the first year and 16% in the 2nd year. HPS lighting increased the number of flowering shoots per square meter from 166 (control) to 262 in ‘Orchid’ and from 10 to 21 in ‘Regina’ during the period November to February.