| N source | Total N-rate (kg∙ha−1) | N-treatment | Plant height (cm) | Plant dry biomass (g∙plant−1) | N concentration (g∙kg−1) | N uptake (mg N plant−1) |
| None | 0 | none | 179az | 38.3ab | 8.7b | 327bc |
| Urea | 45 | Urea-45 | 175a | 40.9a | 9.5b | 379ab |
| Urea | 90 | Urea-90 | 178a | 38.1ab | 10.2 ab | 388ab |
| Urea | 135 | Urea-135 | 175a | 39.1ab | 11.5a | 455a |
| Urea | 180 | Urea-180 | 183a | 39.5ab | 10.1ab | 421a |
| PPB | 45 | PPB-45 | 178a | 41.1a | 6.7c | 278cd |
| PPB | 90 | PPB-90 | 180a | 36.9ab | 6.7c | 245d |
| PPB | 135 | PPB-135 | 180a | 32.7c | 6.3c | 210de |
| PPB | 180 | PPB-180 | 179a | 26.9d | 6.2c | 166e |
| P value |
|
| 0.9858 | <0.0001 | <0.0001 | <0.0001 |