| Cultivar | F0 | F1 |
| Caledon | 0.028a* | 0.033b |
| Ukulinga | 0.039c | 0.044d |
| uMtata | 0.041c | 0.053e |
| Gadra | 0.030a | 0.038c |
| Mean | 0.034 | 0.042 |
| SED (Cultivar × Fertiliser) = 0.002 | ||
| SED (Fertilizer regime) = 0.003 | ||