Table 4.
Results of a two-way ANOVA to find the variance among two years (2012 and 2013), the nine potato cultivars and the variance caused by the interaction between cultivars and the two years at P < 0.001.
| Source of variation | Percentage cover |
||||
|---|---|---|---|---|---|
| df | SS | MS | F-ratio | P-value | |
| Plant height (cm) | |||||
| Year | 1 | 3.001 | 3.001 | 3.481 | 0.070 |
| Cultivars∗ | 8 | 5701.804 | 712.725 | 826.716 | <0.001 |
| Year × cultivars | 8 | 6.747 | 0.843 | 0.978 | 0.468 |
| Residual | 36 | 31.036 | 0.862 | ||
| Total | 53 | 5742.588 | 108.351 | ||
| Number of aerial stems/plant | |||||
| Year | 1 | 0.000267 | 0.000267 | 0.0100 | 0.921 |
| Cultivars∗ | 8 | 12.032 | 1.504 | 56.631 | <0.001 |
| Year × cultivars | 8 | 0.0249 | 0.00312 | 0.117 | 0.998 |
| Residual | 36 | 0.956 | 0.0266 | ||
| Total | 53 | 13.013 | 0.246 | ||
| Tuber number/plant | |||||
| Year | 1 | 1.510 | 1.510 | 3.673 | 0.063 |
| Cultivars∗ | 8 | 200.873 | 25.109 | 61.078 | <0.001 |
| Year × cultivars | 8 | 0.611 | 0.0764 | 0.186 | 0.991 |
| Residual | 36 | 14.800 | 0.411 | ||
| Total | 53 | 217.794 | 4.109 | ||
| Tuber weight/plant (kg) | |||||
| Year | 1 | 0.00106 | 0.00106 | 1.397 | 0.245 |
| Cultivars∗ | 8 | 0.786 | 0.0983 | 129.777 | <0.001 |
| Year × cultivars | 8 | 0.00951 | 0.00119 | 1.570 | 0.168 |
| Residual | 36 | 0.0273 | 0.000757 | ||
| Total | 53 | 0.824 | 0.0155 | ||
| Total yield/hectare (ton) | |||||
| Year | 1 | 0.934 | 0.934 | 1.094 | 0.303 |
| Cultivars∗ | 8 | 1853.133 | 231.642 | 271.418 | <0.001 |
| Year × cultivars | 8 | 7.784 | 0.973 | 1.140 | 0.361 |
| Residual | 36 | 30.724 | 0.853 | ||
| Total | 53 | 1892.575 | 35.709 | ||
∗ indicates the presence of significant differences.