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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flowering by 8, 14, and 24 d, respectively. At flowering, the main stem of plants was approximately 14 cm longer under the B+FR NI than under the INC and B+R+FR NI. Plants grown under the B+FR NI had approximately eight fewer VBs than those grown under NI lighting treatments emitting R light (i.e., the INC, W, B+R, B+R+FR, and R+FR NI). The increase in leaf number showed a similar trend as that for days to flower. All petunia WPI plants flowered under all treatments except the B NI, where flowering percentage was 70% in the second replication. Otherwise, plants flowered similarly under the B NI and SD. Compared with plants grown under the SD, all NI lighting treatments emitting R and/or FR light promoted flowering by 16 to 21 d. Compared with plants grown under the INC NI, flowering was similar under NI lighting treatments emitting R and/or FR light except the W NI. Plants flowered 4 or 5 d earlier under the B+R+FR NI than under NI lighting treatments emitting B light with either R or FR light (i.e., the W, B+R, and B+FR NI). At flowering, extension growth was greatest under the B NI and SD and similar under all the other NI lighting treatments. Plants grown under the W and B+R NI had similar VB number compared with those grown under the INC NI. Plants developed at least twice the number of leaves before flowering under the B NI and SD than the other NI lighting treatments. All rudbeckia plants flowered and at the same time under all NI lighting treatments emitting R light. No plants flowered under the SD or NI lighting emitting B or B+FR light. Compared with plants grown under the INC NI, plant height at flowering was similar under the W and B+R NI and was approximately 10 cm greater under the B+R+FR and R+FR NI. Plants grown under the B+R NI had approximately three more VBs than those grown under the R+FR NI. 71

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