Table 1. F values and P values for variance analysis by a nested mixed model with N treatments as fixed factors and replicate and plant hierarchical level as random factors.
| Response variables | Numerator df | Denominator df | F value | P value |
| Individual biomass (g) | 6 | 55.5 | 16.63 | <.0001 |
| Tiller biomass (10−1 g) | 6 | 57.6 | 6.66 | <.0001 |
| Spike biomass (10−2 g) | 6 | 56.6 | 7.86 | <.0001 |
| Spike-level RA (%) | 6 | 57.5 | 1.08 | 0.3854 |
| Tiller-level RA (%) | 6 | 54.4 | 2.35 | 0.0457 |
| Individual-level RA (%) | 6 | 53.4 | 4.87 | 0.0005 |
| Final RA at the whole plant level (%) | 6 | 56.6 | 1.70 | 0.1376 |