Soybean leaf nitrogen, chlorophyll content, and chlorophyll a/b ratio

By Felix B. Fritschi, Jeffery D. Ray. Photosynthetica (Praha), 2007

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Relationship between specific leaf area, leaf thickness, leaf water content and SPAD-502 readings in six Amazonian tree species (2009, unknown): “As there is a close relationship between leaf nitrogen and leaf Chl content, the SPAD-502 Chl meter has been used as a tool to assess leaf nitrogen content in crops (e.g. Gáborcik 2003, Fritschi and Ray 2007).”
Correlation of Chlorophyll Meter Readings with Gas exchange and Chlorophyll Fluorescence in Flag Leaves of Rice (Oryza sativa L.) Plants (2009, background): “A relationship between the SPAD readings and the leaf Chl content has been established for several crop species (Yamamoto et al., 2002 ; Netto et al., 2005 ; Fritschi and Ray, 2007), and the regression model was different among species in the reports.”
Tolerance vs. avoidance: two strategies of soybean (Glycine max) seedlings in response to shade in intercropping (2015, unknown): “Total Chl content and Chl a/b of soybean leaves between the top and the side of the canopy were significantly different when analyzed across genotypes (Fritschi and Ray 2007), and soybean leaves were thinner as shade increased under crop/tree intercropping system (Manceur et al. 2009).”