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(Apogee Instruments, Logan, UT) at two locations in the greenhouse. Temperature and light sensors were connected to a CR10 datalogger (Campbell Scientific, Logan, UT) and data were collected every 10 s, and hourly means were computed and recorded by a

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(DLI) (cumulative photosynthetic photon flux per day) in the greenhouse were monitored with a data logger (HOBO U12-012; Onset, Bourne, MA) and light sensor (Q-SUN; Apogee Instruments, Logan, UT) from 20 Oct. until harvest on 13 Nov. Minimum and maximum

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) from the fluorescent lamps was measured with an ultraviolet meter (Apogee Instruments, Inc., Logan, UT) and was uniform on the bench space area. The meter was placed vertically with the sensor 0.5 m below the ultraviolet-B source. On 3 May, the plugs

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flux at the top of the plant canopy was measured in each treatment every 10 s with a 10-photodiode line quantum sensor (Apogee Instruments, Logan, UT) connected to a data logger (CR10; Campbell Scientific, Logan, UT). Hourly averages were stored and

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throughout the day. PPF in both structures was confirmed during both studies by obtaining 12 readings using a quantum light meter (Apogee Instruments, Logan, UT) from both inside shade structures and outdoors at solar noon on clear days. Underneath each

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, MA). The chambers featured photosynthetically active radiation ( PAR ) sensors (model SQ-225; Apogee Instruments, Logan, UT). PPFD levels were checked daily, and adjustments to the light canopy height were performed to maintain PPFD levels ±25

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(Apogee Instruments, Inc., Logan, UT)] and fixed woven shadecloths placed above individual propagation compartments that reduced light by ≈30%, 50%, or 70% (DeWitt Company, Sikeston, MO) ( Table 1 ). Air temperature and light intensity were measured at 20

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-SUN; Apogee Instruments Inc., Logan, UT) and thermocouples (Type E Wire chromega/constantan; Omega Engineering Inc., Stamford, CT), respectively, and connected to a data logger (CR10X; Campbell Scientific Inc., Logan, UT), which recorded averages every 10 min

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temperatures during this experimental period were maintained at 23.8 ± 0.9 °C and daily light integral of the photosynthetically active radiation measured by a quantum sensor (Model QSO-SUN; Apogee Instruments, Inc., Logan, UT) was 22.4 ± 2.3 mol·m −2 ·d −1

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normal white light was 25 μmol·m −2 ·s −1 as measured using a LQM 70-10 quantum light meter (Apogee Instruments Inc., Logan, UT). The relative humidity in the culture room was 70% ± 5%. After 40 d of culture, newly sprouted shoots were used to test the

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