## 2 Materials and Methods
### Orthogonal Experiments
\begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Seed** & **Hole** & **Vacuum** & **Rotational** & **Missing** & **Reseeding** & **Qualified** \\
**Type** & **Diameter** & **Pressure** & **Speed** & **Index** & **Index** & **Index** \\  & & **(mm)** & **(kPa)** & **(rpm)** & **(\%)** & **(\%)** & **(\%)** \\ \hline  & & 6 & 10 & 8.59 & 9.89 & 81.52 \\  & & 6 & 14 & 11.72 & 3.65 & 84.63 \\  & 0.6 & 8 & 12 & 8.07 & 11.20 & 80.73 \\  & & 10 & 14 & 7.55 & 16.93 & 75.52 \\  & & 10 & 10 & 5.73 & 20.31 & 73.96 \\ \cline{2-7}  & & 8 & 10 & 4.69 & 19.53 & 75.78 \\  & & 8 & 14 & 8.85 & 13.02 & 78.13 \\ Carrot & 0.8 & 6 & 12 & 10.16 & 11.20 & 78.64 \\  & & 8 & 12 & 5.21 & 14.06 & 80.73 \\  & & 10 & 12 & 3.65 & 19.79 & 76.56 \\ \cline{2-7}  & & 8 & 12 & 4.43 & 32.55 & 63.02 \\  & & 10 & 10 & 1.30 & 42.19 & 56.51 \\  & & 6 & 10 & 5.47 & 17.97 & 76.56 \\  & & 6 & 14 & 6.25 & 11.98 & 81.77 \\  & & 10 & 14 & 4.69 & 37.24 & 58.07 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Orthogonal experiment results for carrot seeds. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**Seed** & **Hole** & **Vacuum** & **Rotational** & **Missing** & **Reseeding** & **Qualified** \\
**Type** & **Diameter** & **Pressure** & **Speed** & **Index** & **Index** \\  & **(mm)** & **(kPa)** & **(rpm)** & **(\%)** & **(\%)** & **(\%)** \\ \hline  & & 6 & 10 & 13.80 & 5.99 & 80.21 \\  & & 6 & 14 & 17.71 & 3.91 & 78.39 \\  & 0.6 & 8 & 12 & 12.50 & 9.64 & 77.86 \\  & & 10 & 14 & 12.50 & 12.24 & 75.26 \\  & & 10 & 10 & 10.68 & 18.75 & 70.57 \\ \cline{2-7}  & & 8 & 10 & 7.29 & 14.32 & 78.39 \\  & & 8 & 14 & 10.42 & 10.16 & 79.42 \\ Sesame & 0.8 & 6 & 12 & 11.98 & 7.55 & 80.47 \\  & & 8 & 12 & 8.85 & 11.72 & 79.43 \\  & & 10 & 12 & 6.77 & 20.05 & 73.18 \\ \cline{2-7}  & & 8 & 12 & 5.73 & 15.36 & 78.91 \\  & & 10 & 10 & 2.86 & 24.48 & 72.66 \\  & & 6 & 10 & 7.03 & 12.50 & 80.47 \\  & & 6 & 14 & 8.59 & 11.20 & 80.21 \\  & & 10 & 14 & 5.21 & 18.75 & 76.04 \\ \hline \hline \end{tabular}
\end{table} 
Table 8: Orthogonal experiment results for sesame seeds. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline \multirow{2}{*}{\begin{tabular}{c} **Seed** \\ **Type** \\ \end{tabular} } & \begin{tabular}{c} **Hole** \\ **Diameter** \\ **(mm)** \\ \end{tabular} & \begin{tabular}{c} **Vacuum** \\ **Pressure** \\ **(kPa)** \\ \end{tabular} & \begin{tabular}{c} **Rotational** \\ **Speed** \\ **(rpm)** \\ \end{tabular} & \begin{tabular}{c} **Missing** \\ **Index** \\ **(\%)** \\ \end{tabular} & \
\begin{tabular}{c} **Reseeding** \\ **Index** \\ **(\%)** \\ \end{tabular} &
\begin{tabular}{c} **Qualified** \\ **Index** \\ **(\%)** \\ \end{tabular} \\ \hline \multirow{8}{*}{Cabbage} & \multirow{4}{*}{0.6} & 12 & 14 & 10.16 & 5.47 & 84.37 \\  & & 10 & 12 & 9.38 & 6.25 & 84.37 \\  & & 8 & 10 & 14.06 & 6.25 & 79.69 \\  & & 8 & 14 & 16.67 & 1.82 & 81.51 \\  & & 12 & 10 & 8.59 & 7.29 & 84.12 \\ \cline{2-7}  & & 10 & 10 & 5.21 & 10.42 & 84.37 \\  & & 10 & 14 & 8.85 & 5.99 & 85.16 \\  & & 8 & 12 & 9.38 & 6.25 & 84.37 \\  & & 10 & 12 & 6.25 & 8.59 & 85.16 \\  & & 12 & 12 & 4.69 & 12.24 & 83.07 \\ \cline{2-7}  & & 8 & 14 & 5.73 & 8.07 & 86.20 \\  & & 8 & 10 & 4.95 & 14.32 & 80.73 \\  & & 10 & 12 & 3.39 & 9.64 & 86.97 \\  & & 12 & 14 & 3.39 & 13.54 & 83.07 \\  & & 12 & 10 & 1.04 & 16.67 & 82.29 \\ \hline \hline \end{tabular}
\end{table} 
Table 10: Orthogonal experiment results for cabbage seeds.