Fig. 8From: Applying spectral fractal dimension index to predict the SPAD value of rice leaves under bacterial blight disease stressSPAD value of rice leaves under different disease levels. The top and bottom black lines represent the maximum and minimum SPAD values, respectively. The red line represents the average SPAD value. The number of rice leaves under disease levels 0 to 5 is 200, 170, 160, 200, 140, and 130, respectivelyBack to article page