ISHS Acta Horticulturae 708: V International Strawberry Symposium
OUT-OF-SEASON STRAWBERRY PRODUCTION IN NORWAY: YIELD RESPONSES OF CV. KORONA TO PHOTOPERIOD PRECONDITIONING TREATMENT |
| Authors: | A. Sønsteby, O.M. Heide, S. Grimsby, L. Grimsby |
| Keywords: | Fragaria × ananassa, greenhouse strawberry cultivation, short-day treatment, flower initiation, crown branching, winter production |
| Abstract:
A system for winter greenhouse production of strawberries was developed in Norway. Plants of the June-bearing cultivar ‘Korona’ were artificially induced to flower with short-day (SD) treatments. Plants were induced to flower three times: in July, in September and in December, and were harvested from November to June. Three week-old strawberry plants exposed to fourteen 12-hour SD cycles in May, were compared to non-treated plants (control) and large, cold-stored tray-plants. Photoperiod preconditioned plants produced significantly more branch crowns than control plants, but less than cold-stored tray-plants. Preconditioned plants produced more fruits than control plants, but the difference was not significant. Cold stored tray-plants had the highest total yield. Large multiple-crown, cold-stored tray-plants are of variable quality, and are expensive in Norway. Photoperiodic preconditioning is potentially useful for increasing strawberry productivity and therefore the profitability of a winter greenhouse production system. | |
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