## Result
### GPN, GPP and GPK
\begin{table}
\begin{tabular}{c c c c c c c c c c} \hline \hline \multirow{3}{*}{**Season**} & \multirow{3}{*}{**Treatment**} & \multicolumn{2}{c}{**Panicle Number**} & \multicolumn{2}{c}{**Spikelets per**} & \multicolumn{2}{c}{**Spikelet Filling**} & \multicolumn{2}{c}{**Thousand Kernel**} & \multicolumn{2}{c}{**Yield (\(\text{h}\,\text{ha}^{-1}\))**} \\  & & **(\(\times 10^{4}\))** & **Panicle** & **Percentage (\%)** & **Weight (g)** & & & \\ \cline{3-10}  & & **2018** & **2019** & **2018** & **2019** & **2018** & **2019** & **2018** & **2019** & **2018** & **2019** \\ \hline \multirow{3}{*}{
\begin{tabular}{c} Early \\ rice \\ \end{tabular} } & N\({}_{1}\)D\({}_{1}\) & 227.28e & 224.69e & 125.24a & 124.13a & 71.59d & 71.08d & 25.37a & 25.38a & 5.06c & 4.91c \\  & N\({}_{1}\)D\({}_{2}\) & 259.21c & 256.89e & 112.81b & 111.70b & 75.71c & 75.20c & 25.35a & 25.29a & 5.47b & 5.32b \\  & N\({}_{1}\)D\({}_{3}\) & 292.07b & 288.79b & 95.25c & 94.14c & 80.91a & 80.40a & 25.33a & 25.24a & 5.55b & 5.40b \\  & N\({}_{2}\)D\({}_{1}\) & 239.33d & 236.71d & 126.13a & 125.02a & 71.58d & 71.07d & 25.39a & 25.39a & 5.42b & 5.27b \\  & N\({}_{2}\)D\({}_{2}\) & 300.32b & 292.78b & 111.55b & 110.44b & 76.52c & 76.01c & 25.36a & 25.17a & 5.91a & 5.76a \\  & N\({}_{2}\)D\({}_{3}\) & 332.56a & 328.94a & 98.82c & 97.71c & 77.85b & 77.34b & 25.15a & 25.23a & 6.01a & 5.86a \\  & N\({}\) & 67.19 \({}^{**}\) & 201.98 \({}^{**}\) & NS & NS & NS & 29.58 \({}^{**}\) & NS & NS & 204.24 \({}^{**}\) & 297.84 \({}^{**}\) \\  & D & 144.96 \({}^{**}\) & 480.06 \({}^{**}\) & 61.85 \({}^{**}\) & 663.04 \({}^{**}\) & 172.81 \({}^{**}\) & 1065.02 \({}^{**}\) & NS & NS & 129.21 \({}^{**}\) & 177.04 \({}^{**}\) \\  & N\({}\)\(\times\) D & 6.33 \({}^{**}\) & 17.96\({}^{**}\) & NS & 4.72 \({}^{**}\) & 11.72 \({}^{**}\) & 72.26 \({}^{**}\) & NS & NS & NS & NS \\ Late & N\({}_{1}\)D\({}_{1}\) & 320.74d & 331.02d & 126.64a & 126.33a & 76.18a & 76.91a & 18.89a & 18.93a & 5.77c & 5.94c \\ rice & N\({}_{1}\)D\({}_{2}\) & 364.76b & 375.19 bc & 120.12 bc & 120.12 ab & 72.95 bc & 73.62 ab & 18.90a & 18.93a & 5.98b & 6.25b \\  & N\({}_{1}\)D\({}_{3}\) & 389.78a & 400.35a & 116.89e & 116.89b & 70.26c & 70.79b & 18.89a & 18.94a & 5.96b & 6.27b \\  & N\({}_{2}\)D\({}_{1}\) & 345.17c & 358.73c & 127.38a & 127.38a & 77.35a & 77.26a & 18.88a & 18.91a & 6.41a & 6.58a \\  & N\({}_{2}\)D\({}_{3}\) & 379.74b & 390.19 ab & 214.13 ab & 124.46 ab & 74.84 ab & 75.33 ab & 18.91a & 18.91a & 6.60a & 6.75a \\  & N\({}_{2}\)D\({}_{3}\) & 398.08a & 408.61a & 120.25c & 119.25b & 72.96 bc & 73.57b & 18.90a & 18.93a & 6.58a & 6.71a \\  & N & 201.95 \({}^{**}\) & 49.35 \({}^{**}\) & 34.87 \({}^{**}\) & 10.22 \({}^{**}\) & 9.37 \({}^{*}\) & NS & NS & NS & 1550.18 \({}^{**}\) & 1159.32 \({}^{**}\) \\  & D & 1015.87 \({}^{**}\) & 207.35 \({}^{**}\) & 114.23 \({}^{**}\) & 39.45 \({}^{**}\) & 25.90 \({}^{**}\) & 13.44 \({}^{**}\) & NS & NS & 63.68 \({}^{**}\) & 102.72 \({}^{**}\) \\  & N\({}\)\(\times\) D & 17.48 \({}^{**}\) & 5.56 \({}^{*}\) & 4.77 \({}^{*}\) & NS & NS & NS & NS & NS & 14.67 \({}^{**}\) \\ \hline \hline \end{tabular} Ni and N\({}_{2}\) represent 120 and 150 kg ha\({}^{-1}\) for early rice and N\({}_{1}\) and N\({}_{2}\) represent 120 and 165 kg ha\({}^{-1}\) for late rice. D\({}_{1}\), D\({}_{2}\) and D\({}_{3}\) represent 86, 143 and 200 plants per m\({}^{2}\) for early rice and D\({}_{1}\), D\({}_{2}\) and D\({}_{3}\) represent 57, 114 and 172 plants per m\({}^{2}\) for late rice. Values followed by different lowercase letters are significantly different at the 0.05 level. NS, \({}^{*}\) and \({}^{**}\) represent no significant difference and significant difference at the 5% and 1% levels.  
\end{table} 
Table 2: Double cropping rice yield and yield compositions response to the N rate and plant density at Xingguo in 2018 and 2019. Figure 2: GP\({}_{N}\), GP\({}_{P}\) and GPK of double cropping rice (**A**–**H) response to the nitrogen (N) rate and plant density in two different ecological regions in 2018 and 2019.