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Effect of supplementary lighting and soil warming on flowering of 3 gerbera cultivars gerbera jamesonii


Effect of supplementary lighting and soil warming on flowering of 3 gerbera cultivars gerbera jamesonii



HortScience 20(2): 271-273



ISSN/ISBN: 0018-5345

Cut flower Gerbera plants were grown in pots or ground benches under various photoperiods, levels of irradiance and soil temperatures. Photoperiodic flowering response varied with the 3 cultivars; 'Appelbloesem' was not sensitive to photoperiod; 'Oranje Nasau' and 'Fabiola' were promoted by short day (SD). In pot-grown Gerbera, SD increased the number of flowers (inflorescences) per plant of 'Oranje Nassau' and 'Fabiola' in the summer-fall and fall-winter. Supplementary lighting with high-pressure sodium (HPS) lamps increased the fall-winter production of all 3 cultivars. Plants grown under 16 h photoperiod by extending natural day length with incandescent light (INC) produced the least flowers per plant in both summer-fall and fall-winter. In bench-grown Gerbera, supplementary HPS increased the number of flowers during the fall-winter as compared to natural daylight (ND). Soil warming from 16.degree.-20.degree. to 23.degree. C had no effect on productivity, but increased the peduncle length.

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Accession: 005273927

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