# Assessment of the Rice Panicle Initiation by Using NDVI-Based Vegetation Indexes
## 4 Conclusions
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{**NDVI\(-\)Based VIs**} & \multirow{2}{*}{**Equation**} & \multirow{2}{*}{**Estimated GDDs**} & \multicolumn{2}{c}{**Actual**} & \multirow{2}{*}{**R\({}^{2}\)**} & \multicolumn{1}{c}{**RE**} \\ \cline{5-6}  & & & **GODs** & & **(\%)** \\ \hline \multirow{5}{*}{700, 720} & y = \(-4.51\times 10^{-7}\)x\({}^{2}+0.0007\)x\({}_{\mathrm{N}}-0.131\) & 776.1 & 771.3 & 0.7 & \multirow{5}{*}{4.9} \\  & y = \(-5.11\times 10^{-7}\)x\({}^{2}+0.0008\)x\({}_{\mathrm{N}}-0.157\) & 782.8 & 713.9 & 0.7 & \multirow{5}{*}{9.08} \\  & y = \(-4.51\times 10^{-7}\)x\({}^{2}+0.0007\)x\({}_{\mathrm{N}}-0.130\) & 776.1 & 783.4 & 0.73 & \multirow{5}{*}{5.76} \\  & y = \(-4.37\times 10^{-7}\)x\({}^{2}+0.0007\)x\({}_{\mathrm{N}}-0.124\) & 800.9 & 791.1 & 0.68 & \\ \hline \multirow{5}{*}{700, 730} & y = \(-6.18\times 10^{-7}\)x\({}^{2}+0.001\)x\({}_{\mathrm{N}}-0.107\) & 809.1 & 771.3 & 0.72 & \multirow{5}{*}{9.08} \\  & y = \(-6.6\times 10^{-7}\)x\({}^{2}+0.001\)x\({}_{\mathrm{N}}-0.127\) & 833.3 & 713.9 & 0.77 & \multirow{5}{*}{9.08} \\  & y = \(-6.08\times 10^{-7}\)x\({}^{2}+0.001\)x\({}_{\mathrm{N}}-0.107\) & 822.4 & 783.4 & 0.75 & \multirow{5}{*}{9.08} \\  & y = \(-6.40\times 10^{-7}\)x\({}^{2}+0.001\)x\({}_{\mathrm{N}}-0.111\) & 781.3 & 791.1 & 0.71 & \\ \hline \multirow{5}{*}{708, 730} & y = \(-4.83\times 10^{-7}\)x\({}^{2}+0.0008\)x\({}_{\mathrm{N}}-0.143\) & 828.2 & 771.3 & 0.74 & \multirow{5}{*}{5.76} \\  & y = \(-5.26\times 10^{-7}\)x\({}^{2}+0.0008\)x\({}_{\mathrm{N}}-0.157\) & 760.5 & 713.9 & 0.78 & \multirow{5}{*}{5.76} \\  & y = \(-4.64\times 10^{-7}\)x\({}^{2}+0.0007\)x\({}_{\mathrm{N}}-0.137\) & 754.3 & 783.4 & 0.77 & \multirow{5}{*}{5.76} \\  & y = \(-4.83\times 10^{-7}\)x\({}^{2}+0.0008\)x\({}_{\mathrm{N}}-0.139\) & 828.2 & 791.1 & 0.72 & \\ \hline \multirow{5}{*}{700,760} & y = \(-8.19\times 10^{-7}\)x\({}^{2}+0.0014\)x\({}_{\mathrm{N}}-0.430\) & 854.7 & 771.3 & 0.73 & \multirow{5}{*}{12.3} \\  & y = \(-8.65\times 10^{-7}\)x\({}^{2}+0.0015\)x\({}_{\mathrm{N}}-0.453\) & 867.1 & 713.9 & 0.76 & \multirow{5}{*}{11.03} \\  & y = \(-7.98\times 10^{-7}\)x\({}^{2}+0.0013\)x\({}_{\mathrm{N}}-0.433\) & 814.5 & 783.4 & 0.76 & \multirow{5}{*}{12.3} \\  & y = \(-8.55\times 10^{-7}\)x\({}^{2}+0.0014\)x\({}_{\mathrm{N}}-0.445\) & 818.7 & 791.1 & 0.71 & \\ \hline \multirow{5}{*}{708, 760} & y = \(-6.59\times 10^{-7}\)x\({}^{2}+0.0011\)x\({}_{\mathrm{N}}-0.456\) & 834.6 & 771.3 & 0.76 & \multirow{5}{*}{11.03} \\  & y = \(-7.00\times 10^{-7}\)x\({}^{2}+0.0012\)x\({}_{\mathrm{N}}-0.471\) & 857.1 & 713.9 & 0.77 & \multirow{5}{*}{11.03} \\  & y = \(-6.28\times 10^{-7}\)x\({}^{2}+0.0013\)x\({}_{\mathrm{N}}-0.453\) & 796.2 & 783.4 & 0.78 & \\ \cline{1-1}  & y = \(-6.7\times 10^{-7}\)x\({}^{2}+0.0011\)x\({}_{\mathrm{N}}-0.461\) & 820.9 & 791.1 & 0.72 & \multirow{5}{*}{7.46} \\ \cline{1-1}  & y = \(-6.61\times 10^{-7}\)x\({}^{2}+0.0011\)x\({}_{\mathrm{N}}-0.333\) & 832.1 & 771.3 & 0.7 & \multirow{5}{*}{7.46} \\ \cline{1-1}  & y = \(-6.87\times 10^{-7}\)x\({}^{2}+0.0011\)x\({}_{\mathrm{N}}-0.342\) & 800.6 & 713.9 & 0.72 & \multirow{5}{*}{7.46} \\ \cline{1-1}  & y = \(-6.26\times 10^{-7}\)x\({}^{2}+0.0010\)x\({}_{\mathrm{N}}-0.326\) & 798.7 & 783.4 & 0.73 & \multirow{5}{*}{7.46} \\ \cline{1-1}  & y = \(-7.17\times 10^{-7}\)x\({}^{2}+0.0011\)x\({}_{\mathrm{N}}-0.345\) & 767.1 & 791.1 & 0.69 & \\ \hline \hline \end{tabular}
\end{table} 
Table 5: Leave-one-out cross-validation of the six selected PI-related NDVI-based VIs by first-order differentiation.