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min by a data logger (Maximizer Precision 10). Quantum sensors (SQ-110; Apogee Instruments Inc., Logan, UT) measured solar PPF every 15 s and the average was logged every 15 min by a data logger (WD 2800; Spectrum Technologies, Aurora, IL

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Purdue GH was monitored and recorded with the Priva environmental computer. Two quantum sensors (Model SQ-212; Apogee Instruments, Inc., Logan, UT) placed at plant height measured light intensity every 30 s and the average of each sensor was logged every

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; Apogee Instruments, Logan, UT, USA). All chambers maintained the same air temperature of 22.0 ± 0.4 °C and relative humidity of 40.0% ± 3.9% throughout the experiment. Chamber environments were recorded by internal chamber sensors and additional third

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(SQ-500; Apogee Instruments, Inc., Logan, UT, USA) to measure the PPFD and a temperature and relative humidity sensor (HOBO MX2301; Onset Computer Corporation, Bourne, MA, USA) to monitor the growing environment at 10-min logging intervals. During the

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compartment controlled by an environmental control system (Gemlink; Hortimax, Rancho Santa Margarita, CA). Air temperature, RH, and DLI were monitored with temperature and RH probes (HMP60-L; Campbell Scientific, Logan, UT) and quantum sensors (SQ512; Apogee

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the timing of each lighting treatment. We measured and adjusted the total photon flux density (TPFD, 400 to 800 nm) at nine representative locations within each bench section (or treatment) with a portable spectroradiometer (SS-110; Apogee Instruments

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a field on the campus of Alcorn State University (lat. 31.8769° N, long. 91.1411° W) located in Lorman, southwest MS, in 2010 and 2011 to determine the effects of Pro-Ca (Apogee ® ; BASF Corp., Research Triangle Park, NC) on sweetpotato vegetative

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provided supplemental lighting of 175 ± 25.0 μmol·m −2 ·s −1 between 800 and 1700 HR in addition to the ambient lighting in each greenhouse. Line quantum sensors (SQ-316-SS; Apogee Instruments, Logan, UT) were placed immediately above the plant canopy in

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18 to 24 °C during the day and 12 to 14 °C at night during the experimental period. The daily light integral (photosynthetically active radiation) was 10 to 20 mol·m −2 ·d −1 measured by a quantum sensor (Model QSO-SUN; Apogee Instruments, Logan

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(4 : 1 v/v) and acclimated in a greenhouse with daily irrigation for 2 weeks before treatments. The seedlings were then moved to a lath house (50% shade) and sprayed until runoff with one of three growth regulators: Apogee (27.7% prohexadione

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