| Treatment | Root length | Root diameter | Harvest index | |||
| 2020 | 2021 | 2020 | 2021 | 2020 | 2021 | |
| Variety |
|
|
|
|
|
|
| Soronko | 13.2 | 14.5 | 2.9 | 3.1 | 0.6 | 0.6 |
| Asetenapa | 13.5 | 16.1 | 2.8 | 2.8 | 0.7 | 0.6 |
| Obatanpa | 13.3 | 14.4 | 3.1 | 3.0 | 0.7 | 0.5 |
| Mean | 13.3 | 16.0 | 2.9 | 3.0 | 0.7 | 0.6 |
| LSD (0.05) | 0.04 | 1.4 | 0.03 | 1.4 | 0.05 | 0.2 |
| Fertilizer (kg N/ha) |
|
|
|
|
|
|
| 0 | 13.4 | 16.2 | 2.9 | 2.7 | 0.7 | 0.6 |
| 30 | 13.5 | 15.9 | 3.0 | 3.0 | 0.7 | 0.6 |
| 45 | 12.7 | 15.7 | 2.8 | 13.0 | 0.6 | 0.6 |
| 60 | 13.6 | 15.8 | 3.0 | 3.0 | 0.7 | 0.6 |
| 90 | 13.5 | 16.8 | 2.9 | 3.1 | 0.06 | 0.6 |
| Mean | 13.3 | 16.0 | 2.9 | 3.0 | 0.7 | 0.6 |
| LSD (0.05) | 1.2 | 1.5 | 0.3 | 0.4 | 0.09 | 0.06 |