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Fig. 2. Noise equivalent of chlorophyll estimation by SPAD and Red Edge Chlorophyll Index (CI_{red edge}) plotted vs. Chl content. As chlorophyll <300 mg/m² (yellowish to green leaves), noise equivalent of SPAD was slightly less than noise equivalent of CI_{red edge}. When chlorophyll >300 mg/m², noise equivalent of SPAD increases drastically indicating sharp decrease in accuracy of estimation of moderate-to-high chlorophyll content by SPAD. Noise equivalent of CI_{red edge} remained constant in a wide range of chlorophyll variation.

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