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Christopher J. Currey and John E. Erwin

and 18 °C, respectively. The plant temperature was measured on the newest fully unfolded leaf pair from five plants of each species in each chamber using an infrared thermometer (Westward 1EZ22A Infrared Thermometer; Grainger Global Sourcing, Lake

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John Erwin, Ken Altman, and Fran Esqueda

four environmental growth chambers (over time) where air temperatures were managed in each to achieve a 10, 16, 22, or 28 °C plant temperature (mean of three different infrared thermometer brands across species). The uppermost “unfolded” (≥45° from the

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Joseph Masabni, Youping Sun, Genhua Niu, and Priscilla Del Valle

calculated as F v /F m = (F m − F 0 )/F m . Leaf temperatures were measured using an handheld infrared thermometer (OS530; Omega Engineering), five plants per treatment per species. The thermometer was pointed at a healthy and fully expanded leaf at a

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Kamal Aberkani, Xiuming Hao, Damien de Halleux, Martine Dorais, Stephen Vineberg, and André Gosselin

parameters were continuously measured at three points inside each greenhouse (center, northeast, and southwest). Leaf temperature was measured using an infrared thermometer [± 0.5 at 25 °C (Raynger ST Pro; Raytek, Santa Cruz, CA)] and was obtained from the

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Ross Braun, Jack Fry, Megan Kennelly, Dale Bremer, and Jason Griffin

.), canopy temperatures at both sites were measured, and averaged, from three locations per plot between 1300 and 1500 hr on cloudless days using a handheld infrared thermometer at a 4-ft height above the canopy (model 100.3ZL; Everest Interscience, Tucson

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Brian Makeredza, Michael Schmeisser, Elmi Lötze, and Willem J. Steyn

potential. Still in the bags, the leaves were cut and water potential measured using a pressure bomb (Model 600; PMS Instrument Co., Albany, OR). FST was measured on Day 0 and Day 15 between 1300 hr and 1400 hr using a handheld infrared thermometer

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Yiwei Jiang, Huifen Liu, and Van Cline

150 to 200 reflectance data points were taken from each plot and the values were averaged. The canopy and air temperature differential (ΔT) was taken using a handheld infrared thermometer (Everest InterScience Inc., Tucson, AZ) in full sun, and at

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Robert C. Morrow

45 min, leaf temperature was measured on three leaves nearest the LED arrays using an infrared thermometer. Maximum leaf temperature under the powered array was 1.5 °C warmer than that for the tomato under the unpowered array. Operating close to the

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Dalong Zhang, Yuping Liu, Yang Li, Lijie Qin, Jun Li, and Fei Xu

–air temperature difference (T c – T a ) vs. VPD under nonstressed and fully stressed conditions, respectively, as described in detail in a previous study ( Zhang et al., 2017 ). Leaf temperature was determined with a digital infrared thermometer (model GM320

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Reagan W. Hejl, Benjamin G. Wherley, James C. Thomas, and Richard H. White

) and end (week 10) of the study using an EC probe (Spectrum Technologies, Aurora, IL). Canopy temperature readings were also recorded on a biweekly basis during cloudless afternoon periods using a handheld infrared thermometer (Model 2956; Spectrum