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LED REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPS

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LED REGULATE FLOWERING OF PHOTOPERIODIC ORNAMENTAL CROPS ( led-regulate-flowering-photoperiodic-ornamental-crops )

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Table IV-3. Days to first visible bud or inflorescence (VB), main stem length at flowering, VB number per plant at flowering, and increase in leaf number from transplant at flowering for five long-day plants and one short-day plant, marigold. Plants were grown under a truncated 9-h short-day (SD) treatment with or without 4-h night-interruption (NI) and/or 5.5-h day-extension (DE) lighting from light-emitting diodes (LEDs). Numbers that follow blue (B) light represent their intensities in μmol·m−2·s−1. The asterisk (*) indicates low-intensity lighting provided by red+white+far-red LEDs. All data within each species were pooled across experimental replications. Photoperiod treatment SD B0* DE B0* NI B1* NI B15* NI B30* NI B30 NI B0* DE+B30 NI Treatment Replication Treatment×replication SD B0* DE B0* NI B1* NI B15* NI B30* NI B30 NI B0* DE+B30 NI Treatment Replication Treatment×replication SD B0* DE B0* NI B1* NI B15* NI B30* NI B30 NI B0* DE+B30 NI Treatment Replication Treatment×replication Stem length Days to VB (cm) VB number Increase in leaf number − − − − − − − − − − − − 17.9 a 16.1 ab 15.6 b 17.2 ab 16.4 ab 17.1 ab 17.5 ab * NS NS 46.5 a 22.2 b 21.3 bc 20.6 bc 20.1 bc 19.2 c 20.8 bc 21.6 b *** * * Calibrachoa ‘Callie Yellow Improved’ − 17.5 a 15.7 ab 14.7 ab 13.8 ab 13.1 b 14.3 ab 15.1 ab * *** NS − 14.9 ab 14.0 ab 14.1 ab 14.9 ab 13.3 b 12.2 b 17.0 a * *** NS − 8.5 a 7.1 a 7.2 a 5.9 a 5.6 a 7.8 a 7.1 a NS *** * − 19.8 a 15.1 abc 12.5 c 15.6 abc 14.1 bc 16.5 abc 17.9 ab * NS * 14.3 b 22.1 a 20.9 a 19.5 ab 19.4 ab 19.2 ab 20.8 a 18.8 ab * NS NS Coreopsis ‘Early Sunrise’ − 50.0 a 43.5 abc 41.9 c 46.0 abc 42.8 bc 47.4 abc 47.7 ab * *** * − 32.3 a 30.4 ab 33.8 a 31.7 ab 33.7 a 28.1 b 34.2 a *** *** NS Petunia ‘Wave Purple Improved’ 56.6 a 31.6 b 28.2 bc 27.9 bc 27.3 c 27.0 c 27.6 bc 30.1 bc *** *** *** 35.7 a 28.2 ab 25.3 b 26.3 b 26.2 b 25.4 b 26.8 b 29.0 ab * * * 113

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