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| Variable | Control | Treated |
| Non-Knapweed | 311.8 ± 53.8 | 178.4 ± 18.1 |
| Knapweed | 65.6 ± 34.4 | 40.9 ± 19.1 |
| Total | 377.5 ± 70.3 | 219.2 ± 27.6 |
Table 3: Comparison of average biomass amounts for control and treatment plots. Biomass is broken down into three categories: non-knapweed biomass, mature knapweed biomass, and the total biomass. The amounts listed reflect the average biomass of all eighteen treatment or control plots. The biomass of the knapweed plots with knapweed (nine treatment plots and five control plots) was averaged over all eighteen plots. All are significantly different (P < 0.05).
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