ISHS Acta Horticulturae 424: II International Rose Symposium
EFFECT OF LIGHT AND ELECTRIC CONDUCTIVITY OF THE GROWING MEDIUM ON GROWTH AND YIELD OF ROSES PRUNED IN SUMMER |
| Authors: | H.R. Gislerød, V. Revhaug, H. Mikkelsen |
| Abstract:
The rose cultivar Jaguar was grown in a greenhouse at five levels of supplementary irradiation in 20 h day-1, (43, 87, 174, 350 and 520 μmol m-2s-1 PPFD), and at two levels of fertilizer application, (1.6 and 3.5 mS cm-1 electric conductivity (EC) of the growing medium. The plants were pruned June 30 and bud break, yield and some quality aspects of roses harvested during the following two flushes were recorded. Bud break was enhanced by increase in the PPFD before pruning. The number of roses harvested in the following two flushes increased with increasing PPFD up to 350 μmol m-2s-1, while the proportion of longstemmed roses decreased. Bud break as well as the yield were enhanced by increasing the EC. The EC had no effect on shoot length except at 520 μmol m-2s-1 where high EC gave a higher proportion of short roses. | |
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