Mean growth values of 5 ERC clusters
| Cluster | Geography | Height m (ft) | Survival (%) | Dbh cm (in) | Densityz -- | # stems -- | Branch y -- | Vigor x -- |
|---|---|---|---|---|---|---|---|---|
| 1 | Eastern NE | 5.8 (18.9) a | 100 a | 13.0 (5.1) a | 4.1 a | 1.5 c | 2.0 a | 4.9 a |
| 2 | Scattered NE, KS, OK | 5.4 (17.6)b | 100 a | 11.7 (4.6) b | 3.9 a | 1.6 c | 1.9 a | 4.9 a |
| 3 | SE & central KS | 4.9 (16.1) c | 100 a | 9.7 (3.8) b | 3.6 b | 2.0 a | 1.9 a | 4.7 b |
| 4 | South. OK & NE TX | 4.2 (13.9) d | 100 a | 7.4 (2.9) b | 3.5 b | 1.9 ab | 1.9 a | 4.6 b |
| 5 | SE TX | 3.5 (11.4) d | 99ab | 4.6 (1.8) c | 2.6 c | 1.7 ab | 2.0 a | 3.9 c |
| Prob. (%) | -- | <1 | <1 | <1 | <1 | <1 | 9 | <1 |