Results
At Grass Patch in 2013 the density trial suffered from attack by birds. The birds preferentially attacked the low density plots and the slightly later flowering/maturing hybrid TT variety Hyola 450TT. Therefore the yields of the low density plots were lower than expected and the economic optimums were higher than expected. However, the results from this site should be treated with caution and data from the Grass Patch site have not been included in calculating average economic densities summaries across WA.
| Location | CB Telfer or ATR Stingray | Hyola 450TT | GT Viper | Hyola 404RR | Comments |
|---|---|---|---|---|---|
| Cunderdin | 25 | 22 | 28 | 17 | No comments |
| Eradu | 34 | 33 | 24 | 16 | No comments |
| Grass Patch* | 53 | 71 | 53 | 41 | Low density treatments targeted by birds |
| Holt Rock | 39 | 20 | 30 | 38 | No comments |
| Katanning | 39 | 24 | 39 | 21 | TT blocks weedier, more ryegrass in low density |
| Merredin | 22 | 20 | 17 | 18 | TT blocks weedier, more ryegrass in low density |
| Miling | 36 | 27 | 20 | 12 | Low establishment, low density = more ryegrass |
| Mullewa | 19 | 12 | 10 | 14 | Extended dry period and aphids |
| Pingrup | 29 | 23 | 19 | 18 | No comments |
| Salmon Gums | 31 | 25 | 22 | 18 | Late emerging barley grass understory in RR blocks |
| Wongan Hills | 40 | 35 | 34 | 21 | TT blocks weedier, more ryegrass in low density |
* Low density treatments at Grass Patch were preferentially attacked by birds; therefore this site was excluded from META analysis.