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 II-1. Trial period, lamp type, lamp power, number of lamps per treatment, average daily temperature (ADT), and daily light integral (DLI) at different trial sites, including C. Raker & Sons, the Center for Applied Horticultural Research (CfAHR), Henry Mast Greenhouse, Krueger-Maddux Greenhouses, Kube Pak, and two separate greenhouses at Michigan State University (MSU), in a coordinated trial. Plants were grown under short days with or without 4-h night-interruption lighting from high-pressure sodium (HPS), incandescent (INC), compact fluorescent (CFL), or red+white+far-red light-emitting diode (LED) lamps. The short-day (SD) treatment at CfAHR was a natural day, whereas that at MSU was truncated to 9 h. –, No data. Trial site C. Raker & Sons CfAHR Henry Mast Greenhouse Krueger-Maddux Greenhouses Kube Pak Trial period (2013) 1 Feb.–10 Apr. 2 Feb.–4 Apr. 1 Feb.–8 Apr. 28 Jan.–20 Apr. 18 Feb.–4 Apr. Lamp Lamp power type (W) HPS 400 LED 14 SD – INC 150 LED 14 HPS 400 LED 14 INC 100 LED 14 CFL 15 INC 150 LED 14 No. of lamps per treatment 2 8 – 2 2 1 6 5 6 3 3 6 – 2 2 – 2 2 Photoperiodz (h) ADT DLI (°F) (mol·m−2·d−1) MSU house 10E MSU house 13B zThe photoperiod was from sunrise to sunset at each trial site except at MSU, which 5 Feb.–24 June 5 Feb.–24 June SD – INC 60 LED 14 SD – INC 60 LED 14 10.02–13.12 68.0 64.1 10.62–12.63 70.6 71.1 70.8 9.95–13.03 10.08–13.42 10.82–12.78 65.7 9.00 69.3 67.1 67.3 9.00 69.1 69.3 69.1 17.4 12.1 20.5 20.8 19.4 8.9 13.3 9.0 – – – 11.3 11.3 11.3 63.1 62.0 47 was truncated with black cloth.

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