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Amir Ali Khoddamzadeh and Bruce L. Dunn

concentration ( Hardin et al., 2012 ). Besides SPAD, atLEAF is a newly developed chlorophyll sensor that is a less expensive alternative to the SPAD meter. Both meters measure transmittance through leaf surfaces in wavelengths associated with chlorophyll, thus

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Bruce L. Dunn and Carla Goad

-emitting diode to measure chlorophyll absorbance (650 nm) and nonchlorophyll absorbance (940 nm), respectively, although a new and cheaper alternative chlorophyll meter, atLEAF (FT Green LLC, Wilmington, DE), measures chlorophyll absorbance and nonchlorophyll

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Hardeep Singh, Bruce Dunn, Mark Payton, and Lynn Brandenberger

atLEAF, FT Green, Wilmington, DE) at the time of harvest. For each plant, SPAD and atLEAF readings were taken from three different mature leaves from the base, middle, and top of the plant. Two plant samples from each treatment were sent for nutrient

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David A. Baumbauer, Colleen B. Schmidt, and Macdonald H. Burgess

.5-micro pixel iSight camera, aperture f/2.2). The chlorophyll content was estimated using an atLEAF+ chlorophyll meter (FT Green LLC, Wilmington, DE), which compared the transmission of light in red and near-infrared wavelengths to determine the

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Samuel E. Wortman, Michael S. Douglass, and Jeffrey D. Kindhart

chlorophyll ( Zhu et al., 2012 ), was recorded monthly with an atLEAF+ meter (FT Green, Wilmington, DE). Greenness was measured near the middle of the newest fully emerged leaf from one plant per tower level in all factorial treatment combinations

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Rhuanito S. Ferrarezi, Stuart A. Weiss, Thomas C. Geiger, and K. Paul Beamer

shoot dry weight and chlorophyll content using a portable meter (atLEAF; FT Green, Wilmington, DE) in three samples per plot. We monitored the soil volumetric water content using four capacitance sensors (10HS; Decagon Devices, Pullman, WA) connected to

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Emily E. Braun, Sarah Taylor Lovell, Mohammad Babadoost, Frank Forcella, Sharon Clay, Daniel Humburg, and Sam E. Wortman

height of the plant from the base of the stem to the top of the newest, fully emerged leaf extended vertically. Leaf greenness was measured near the center of the newest fully emerged leaf using a handheld greenness sensor (atLEAF+; FT Green LLC

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Augusto Ramírez-Godoy, María del Pilar Vera-Hoyos, Natalia Jiménez-Beltrán, and Hermann Restrepo-Diaz

was estimated by a chlorophyllometer (Chl Plus; atLEAF, Wilmington, DE). Measurements of F v / F m and relative chlorophyll content were also taken at 2 and 4 WAT on leaves located at two cardinal points of the tree canopy (west and east). Relative