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(SQ-212; Apogee Instruments, Inc., Logan, UT) measured solar PPF every 30 s under each light treatment, and the average of each sensor was logged every 15 min by a data logger (Watchdog 2800 Weather Station; Spectrum Technologies, Inc

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Mar. 2021, when it was adjusted to 20/16 °C to discourage tuberization ( De Hertogh and Le Nard, 1993 ). Light intensities were recorded hourly using a heated silicon chip pyranometer (SP-230; Apogee Instruments, Logan, UT) mounted to a weather station

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, Lancashire, UK). A no-plastic (NP) treatment was also included. Field spectral transmittance. In 2018, spectral distributions within the tunnels were measured at solar noon ±1 h on cloudless days with an Apogee model PS-300 spectroradiometer equipped with a

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measured using an Apogee MQ-200 Quantum Separate Sensor (Apogee Instrument, Logan, UT) and was determined to be 200 ± 68 µmol·m −2 ·s −1 at the canopy level, on average. The greenhouse temperature was set constant at 22 °C. The plants were watered with

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sensor bar (SQ316; Apogee Instruments, Logan, UT) placed on top and parallel to the orientation of one cordon in each leaf removal treatment. Ambient PAR was measured with a quantum sensor bar (SQ316; Apogee Instruments) mounted level at about 3 m above

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and averaged into 15-min increments by a weather station (Silent Sentinel; Apogee Instruments, North Logan, UT, USA) placed at canopy height. Photosynthetic photon flux density and daily light integrals (DLI) were measured with a full-spectrum quantum

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photon flux density (PPFD) was monitored weekly with an Apogee Instruments, six-sensor light bar inside the chambers at canopy height (model SQ-306; Apogee Instruments Inc., Logan, UT, USA). Eight HPS lamps provided supplemental lighting of 20 mol⋅m −2 ⋅d

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measured with an Apogee Quantum Meter (Apogee Instruments Inc., Logan, UT). Daylengths were maintained at 14 h for both runs of the study. Greenhouse temperatures were set between 17 and 24 °C (average temperature = 17.5 °C; sd = 0.74) and were monitored

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. Another GA 3 treatment (50 mg·L −1 ) was applied ≈4 months before harvest (28 July 2001) to accelerate fruit development and rate of maturation. Foliar ProCa treatments (250 mg·L −1 ), prepared from Apogee (27.5% prohexadione calcium; BASF Corp., Research

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a Perkin Elmer (Waltham, MA) Lambda3B spectrophotometer. Photosynthetic photon flux was measured with an Apogee QMSW-5S quantum meter (Apogee Instruments Inc., Logan, UT) and was 15 μmol·m −2 ·s −1 levels for lights covered with red cellophane

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