Table 2: Variation among population sources in half-sib progeny performance for seasonal biomass yield 1-cut systems (Knoxville, TN, 2010-2011).
| Statistics | All data | ARK | OKN | OKS | TX |
| ------------------Mean biomass yield Kg plant-1------------------ | |||||
| Mean | 1.41 | 1.01 | 1.52 | 1.50 | 1.58 |
| Minimum | 0.38 | 0.38 | 1.12 | 0.85 | 1.09 |
| Maximum | 2.46 | 1.58 | 2.46 | 1.98 | 1.99 |
| LSD | 0.42** | 0.43** | 0.45** | 0.41** | 0.41** |
**Significant at the 0.01 probability level.