Flowering control of small-flowered chrysanthemums (Dendranthema grandiflorum(Ramat.) Kitamura) with July flowering type by night-break lighting treatment: Systematic production for high demand time

• Published in: Engeigaku kenkyuu Vol. 3; no. 1; pp. 63 - 66
• Main Authors: Koyama, Y. (Hyogo-ken. Agricultural Inst., Kasai (Japan)), Wada, O
• Format: Journal Article
• Language: Japanese
• Published: THE JAPANESE SOCIETY FOR HORTICULTURAL SCIENCE 2004
• Subjects: CUT FLOWERS; DENDRANTHEMA; FLOWERING; HARVESTING DATE; PHOTOPERIODICITY; SUMMER
• ISSN: 1347-2658; 1880-3571
• DOI: 10.2503/hrj.3.63

For the purpose of systematic production in an open field, small-flowered chrysanthemums responding to day-length were selected from cultivars of the July-flowering type, and the possibility of shipping during the peak demand period facilitated by the night-break lighting treatment was examined. 1. Small-flowered chrysanthemums of 13 cultivars responding to day-length were selected from 14 cultivars that flowered in July under natural conditions. When 8 small-flowered chrysanthemum cultivars responding to day-length were planted on April 19th with night-break lighting treatment discontinued on June 11th, 4 small-flowered chrysanthemum cultivars flowered in early August, fulfilling high consumer demand. 2. Systematic production of the combined small-flowered chrysanthemum which flowers in July under night-break lighting facilitated shipping in time for the Lantern festival, because the annual difference in the response period for flowering after the night-break lighting treatment was small. 3. The flowering response period after night-break lighting treatment during the high-temperature season from June to August fluctuated in proportion to changes of the natural day-length. This result suggested the possibility of shipping for the equinoctial week as well as continuous shipping of the same cultivar.