Fig. 4
From: A low-cost and open-source platform for automated imaging
a Spectral response of plants due to drought stress. Leaf reflectance ratio of 782 nm and 544 nm (i.e., R782/R544) as: trend in leaf subsets (mean ± SD), time series of representative control and drought stress plants. b Spectral response of plants due to saline stress. Ratio-metric comparison (R676/R743) of leaf reflectance as: trend in leaf subsets (mean ± SD), time series of representative control and drought stress plants. The wavelengths chosen for ratios are confirmed by the significant relationships shown in Fig. 3