Fig. 1. DA7250 diode array nalyzer

Fig. 2. Samples of peanut seed coats with different colors
(a): Black purple peanut kernels; (b): Red peanut kernels; (c): Pink peanut kernels

Fig. 3. Scanning spectrum of black-purple samples

Fig. 4. Scanning spectrum of red samples

Fig. 5. Scanning spectrum of pink samples

Fig. 6. Correction model and prediction model of peanut seed sugar content in different seed coat colors
(A), (a): Black-purple coat, sucrose content; (B), (b): Black-purple coat, solublesugar content; (C), (c): Black-purple coat, total sugar content; (D), (d): Red coat, sucrose content; (E), (e): Red coat, solublesugar content; (F), (f): Red coat, total sugar content; (G), (g): Pink Color coat, sucrose content; (H), (h): Pink coat, soluble sugar content; (I), (i): Pink coat, total sugar content