# Test Trials and Analysis of Pod-Shattering Characteristics of Harvested Rapeseed Silique
## 3 Results and Analysis
### Impending Fracturing Test Results and Analyses
#### 3.2.3 Effect of Loading Speed and Silique Growth Position on Mechanical Properties of Siliques  
Zhenyou 8 was used as the research object, and 12 siliques each were selected from the top, middle, and bottom of the main rapeseed branch. The previous analysis showed that the stability of the silique carpopodium and peak support was poor, and the silique was easier to rupture and shatter when the bonding surface of the petals was subjected to force. The silique body was selected as the support position and the direction of the front of the silique petals to be loaded at the loading speeds of 5 mm\(\cdot\)min\({}^{-1}\), 15 mm\(\cdot\)min\({}^{-1}\), and 25 mm\(\cdot\)min\({}^{-1}\), respectively. Before the start of the test, the water content of the silique was measured to be 14.8%, the water content of the seed was 16.31%, and the test data are shown in Table 10. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Source of Variation** & **SS** & **f** & **MS** & **F Value** & **\(p\) Value** \\ \hline Rapeseed varieties & 1.055 & 2 & 0.528 & 21.668 & \textless{}0.001 *** \\ Silique different stress surfaces & 6.687 & 1 & 6.687 & 274.563 & \textless{}0.001 *** \\ Rapeseed varieties \(\times\) different stress surfaces & 0.145 & 2 & 0.072 & 2.969 & 0.06 \\ Error & 1.315 & 4 & 0.024 & & \\ Total variation & 9.202 & 9 & & & \\ \hline \hline \end{tabular} Note: *** indicate significant correlation at 0.05 level.  
\end{table} 
Table 8: Analysis of variance table of maximum cracking force of silique on rapeseed varieties and stress surfaces. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline
**Source of Variation** & **SS** & **df** & **MS** & **F Value** & **\(p\) Value** \\ \hline Rapeseed varieties & 3.110 & 2 & 1.555 & 4.798 & 0.012 \\ Silique different stress surfaces & 30.774 & 1 & 30.774 & 94.976 & \textless{}0.001 \\ Rapeseed varieties\(\times\)Different stress surfaces & 6.731 & 2 & 3.366 & 10.387 & \textless{}0.001 \\ Error & 17.497 & 54 & 0.324 & & \\ Total variation & 58.111 & 59 & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 9: Analysis of variance table for flexural strength of silique on rapeseed varieties and stress surfaces. From the data in Table 10, it can be seen that the maximum cracking force and flexural strength required for silique shattering at the middle of the rapeseed plant were the greatest, and the maximum cracking force and flexural strength of the silique at the middle of the rapeseed plant were also greater than those of the bottom and top siliques at the same loading speed. The average values of the maximum cracking force and flexural strength of siliques were maximum at a loading speed of 15 mm\(\cdot\)min\({}^{-1}\). The homogeneity test of variance for maximum cracking force (\(p=0.304>0.05\)) and flexural strength (\(p=0.282>0.05\)) was performed on the test results under the distribution position of siliques and different loading speed treatments, respectively, and the data showed normal distribution, which satisfied the requirement of analysis of variance. The analysis of variance of the maximum cracking force of siliques under different loading speeds and silique growth positions is shown in Table 11.  
The \(p\)-values for both locations of silique growth and loading speed were less than 0.01, indicating that the effect of the two factors on the maximum cracking force of rapeseed siliques was extremely significant within 99% of the confidence interval. Multiple comparisons of the maximum cracking force of siliques under different distribution positions of siliques were carried out using the SNK method. The maximum cracking force of siliques at the middle of the main rapeseed branch was significantly different from that of siliques in other positions, and the difference in the maximum peak force of shattering between siliques at the bottom and top of the main rapeseed branch was not significant.