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SPAD and atLEAF values were strongly correlated and not affected by the different measurement conditions. The atLEAF Chl meter can therefore be used as an inexpensive alternative to the SPAD-502 meter, although the latter was found to be easier to handle.

Juanjuan Zhu¹, Nicolas Tremblay², and Yinli Liang^1,3
1College of Life Sciences, Northwest AF Univ., China; 2Horticulture Research and Development Centre, Agriculture and Agri-Food Quebec, Canada; and 3Institute of Soil Water and Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, P.R. China.

Notably, our results revealed that even low-cost chlorophyll meters such as the atLEAF CHL PLUS and PhotosynQ MultispeQ V1.0 can provide similar (and in some cases, stronger) relationships with destructively-determined LCC when compared with well-established instruments such as the Konica Minolta SPAD-502+ and Opti-Sciences CCM-200. In the case of the atLEAF CHL PLUS, this is despite the fact that the instrument does not clamp the leaf (which could allow the ingress of ambient light and slight movements of the leaf). Similar results were presented by Zhu et al. (2012), who found atLEAF CHL PLUS measurements demonstrated no significant effects associated with irradiance or time of day.

Luke A. Brown , Owen Williams, Jadunandan Dash
School of Geography and Environmental Science, University of Southampton, Highfield, Southampton, SO17 1BJ, UK