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Genhua Niu, Minzi Wang, Denise Rodriguez, and Donglin Zhang

were selected randomly among the different cultivars per treatment for the described salinity analysis. Leaf greenness (or relative chlorophyll content) was measured using a handheld chlorophyll meter (measured as the optical density, SPAD reading

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Xiaojie Zhao, Guihong Bi, Richard L. Harkess, Jac J. Varco, and Eugene K. Blythe

higher root zone electrical conductivity, which causes lower gas exchange rates, shoot DW, and SPAD readings ( Niu et al., 2011 ). Increasing N supply may decrease NupE and lead to more N runoff to the environment ( Syvertsen and Smith, 1996

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James C. Locke, James E. Altland, and Deanna M. Bobak

for deficiency symptoms and chlorophyll measurements (Minolta- 502 SPAD meter; Spectrum Technologies, Inc., Plainfield, IL) were taken with five readings on five independent recently matured leaves per bucket every other day. All plants were harvested

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Charles Zachry Ogles, Joseph M. Kemble, Amy N. Wright, and Elizabeth A. Guertal

. Leaf chlorophyll measurements were taken weekly until harvest using the SPAD 502 Chlorophyll meter (SPAD 502; Minolta Co. Ltd., Japan). Five readings were taken from randomly selected plants with recently expanded, mature leaves in each plot and

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Dámaris L. Ojeda-Barrios, Eloísa Perea-Portillo, O. Adriana Hernández-Rodríguez, Graciela Ávila-Quezada, Javier Abadía, and Leonardo Lombardini

trees grown in Aldama, Chihuahua, Mexico. z There was a good correlation between the SPAD readings and chlorophyll concentration at the L5 stage, water stage of the nut ( Fig. 1 ). All Zn treatments increased total leaf area when compared with the

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Rangjian Qiu, Taisheng Du, Shaozhong Kang, Renqiang Chen, and Laosheng Wu

that, most of the time, leaf SPAD in N 1 was close to that in N 2 , but they were both significantly higher than that in N 3 . Leaf area index had a similar trend ( Fig. 9B ) as the SPAD reading among the N treatments. No significant differences were

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Shasha Wu, Youping Sun, and Genhua Niu

similar middle positions of shoots for all living plants in each treatment using a portable chlorophyll meter (measured as the optical density, SPAD reading; Minolta Camera Co., Osaka, Japan) at the end of the experiment (19 June). Chlorophyll fluorescence

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Yung-Liang Peng, Fang-Yin Liu, Rong-Show Shen, and Yu-Sen Chang

readings, averaged from measurements at six locations on each leaf, were obtained with a chlorophyll meter (SPAD-502; Minolta, Osaka, Japan). Leaf chlorophyll a and chlorophyll b weremeasured spectrophotometrically in the laboratory in 80% acetone

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Diana R. Cochran, Richard L. Harkess, Patricia R. Knight, Maria Tomaso-Peterson, Eugene K. Blythe, and Charles H. Gilliam

mL·L −1 ) z to plants grown in containers maintained at three target substrate volumetric water contents (TVWCs) (Expt. 1; n = 72). Leaf greenness, photosynthesis, and midday stem water potential (Expt. 1). SPAD readings were greatest using the 0

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Jason J. Danaher, Jeremy M. Pickens, Jeffrey L. Sibley, Jesse A. Chappell, Terrill R. Hanson, and Claude E. Boyd

dewatered aquaculture effluent (AE) from a freshwater nile tilapia production system at 0, 16, and 36 d after planting (DAP) and SPAD readings at 36 DAP. The experiment was performed in a gutter-connected, twin-wall polycarbonate greenhouse at the Paterson