| NP doses (kg∙ha−1) | Varieties | Mean | |
| S-17 | Pr-125 | ||
| No fertilizer (Control) | 6.67 | 5.00 | 5.83 d |
| NP @ 30 - 30 | 12.33 | 11.00 | 11.67 c |
| NP @ 50 - 30 | 16.00 | 14.00 | 15.00 b |
| NP @ 50 - 50 | 16.67 | 15.00 | 15.83 ab |
| NP @ 70 - 50 | 19.00 | 16.33 | 17.67 ab |
| NP @ 70 - 70 | 20.00 | 17.00 | 18.50 a |
| Mean | 15.11 a | 13.06 b | - |