Responses of rice leaf thickness, SPAD readings and chlorophyll a/b ratios to different nitrogen supply rates in paddy field

By Li Jinwen, Yang Jingping, F. Pinpin, Song Junlan, Ge Chang-shui, Chen Wenyue. 2009

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Chlorophyll as a measure of plant health: agroecological aspects. (2014, background): “The level of CO2 uptake is an important component of crop productivity and it is almost proportional to nitrogen content (Jinwen et al. 2009).”
SPAD Values and Nitrogen Nutrition Index for the Evaluation of Rice Nitrogen Status (2014, result): “Li et al. (2009) confirmed this conclusion by investigating leaf thickness.”
Evaluating physiological responses of plants to salinity stress (2016, background): “…be noted that the interpretation of SPAD meter measurements is not straightforward because salinity stress can increase leaf thickness (Longstreth and Nobel, 1979) and thus influence SPAD meter readings in a way that is independent of effects of salinity on chlorophyll content (Li et al., 2009).”
A Quantitative Trait Locus for Chlorophyll Content and its Association with Leaf Photosynthesis in Rice (2010, background): “However, previous studies have indicated that SPAD values may sometimes reflect variation in leaf thickness, because the readings are based on the leaf chlorophyll’s absorption of specific spectral bands of light, which may be influenced by leaf thickness (Peng et al. 1993; Jinwen et al. 2009).”