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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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Coreopsis ‘Early Sunrise’ Most plants (≥80%) flowered under all lighting treatments, whereas no plants flowered under the SD (data not shown). Flowering time was similar under R+W+FR NI lighting treatments irrespective of additional low- or high-intensity B light (Figure IV-2). The B30 NI was as effective at promoting flowering as the B0* NI. Plants under the B0* DE flowered 7 d later than those under the B0* NI and formed VB 7 or 8 d later and developed 40 to 58% more VBs at flowering than those under the B1* NI and B30* NI (Table IV-3). Plants were 13 to 18% shorter under the B30 NI than under all other lighting treatments except the B0* NI and B15* NI. Plants developed two more leaves before flowering under the B0* DE than under the B1* NI. Petunia ‘Wave Purple Improved’ All plants under all lighting treatments formed VB and flowered 24 to 31 d earlier than those under the SD (Table IV-3, Figure IV-2). Flowering percentage under the SD was 100% and 40% in the first and second replications, respectively (data not shown). The B30 NI was as effective at promoting flowering as all the other NI lighting treatments delivering R+W+FR light. Plants under the B0* DE flowered 5 d later than those under the B0* NI. Formation of the first VB was 4 to 5 d earlier under the B15* NI and B30* NI than under the B0* DE. The main stem length of plants at flowering under the SD was 33 to 41% greater than that under all the other treatments delivering only NI lighting. Visible bud number was similar under all lighting treatments. Plants under the B0* DE, B0* NI, and B30 NI had 45 to 55% more VBs than those under the SD. Leaf number was 24 to 27 greater under the SD than under all lighting treatments. Plants under the B0* DE and B0* DE+B30 NI had 2 or 3 more leaves than those under the B30* NI. Rudbeckia ‘Indian Summer’ 102

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