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Effects of year-round supplementary lighting on shoot development, flowering and quality of two glasshouse rose cultivars


Scientia Horticulturae (Amsterdam) 54(1): 69-85
Effects of year-round supplementary lighting on shoot development, flowering and quality of two glasshouse rose cultivars
The cut rose cultivars 'Korflapei' Frisco and 'Bergme' Gabriella were subjected to 12 equally spaced supplementary photosynthetic photon flux density (PPFD) levels, 0-174 mu-mol s-1 m-2. Supplementary lighting was supplied by high pressure sodium (HPS) lamps for 20 h day-1 all year, whenever the natural PPFD level inside the glasshouse dropped below 74 mu-mol s-1 m-2. Supplementary PPFD and yield and quality were linearly related. Increasing PPFD by a constant quantity had a consistent effect on rose yield throughout the year. At a supplementary PPFD of 87 mu-mol s-1 m-2 Frisco yielded 62% and Gabriella 33% more saleable blooms per square metre of bed area per year compared with traditional cultivation without supplementary lighting. In addition, the percentage of first grade blooms was enhanced by 4-8%, while the percentage of blind shoots was halved. Fresh weight was enhanced by 55% and 56% and stem length by 10% nd 13% for Frisco and Gabriella, respectively and Gabriella stem diameter increased by 19% when supplementary PPFD was increased from 0 to 174 mu-mol s-1 m-1. Frisco utilized supplementary PPFD better than Gabriella. Possible mechanisms for the effects of supplementary lighting on cut rose growth and development are discussed.

Accession: 002367239

DOI: 10.1016/0304-4238(93)90084-4

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