| Researcher(s) |
Amanda Cook (SARDI) Ian Richter (SARDI) |
|---|---|
| Year(s) | 2018 |
| Contributor | Eyre Peninsula Agricultural Research Foundation |
| Trial location(s) |
Minnipa, SA
|
| Related trials |
|
Barley grass continues to be a persistent grassy weed in low rainfall farming systems and current farming practices have selected for increased seed dormancy. This change in seed dormancy has resulted in Barley grass germinating later, and being much harder to control with knockdown and pre-emergent herbicides. In 2018 a range of herbicide strategies was tested for their effectiveness on a high density population of Barley grass.
| Lead research organisation |
Eyre Peninsula Agricultural Research Foundation |
|---|---|
| Host research organisation |
SARDI Minnipa Agricultural Centre |
| Trial funding source | GRDC EPF00001 |
| Related program |
Maintaining profitable farming systems with retained stubble |
| Acknowledgments |
Funded by the extension of EPF00001 GRDC Maintaining profitable farming systems with retained stubble - upper Eyre Peninsula, finishing in December 2018. Thank you to Fiona Tomney and Steve Jeffs for helping collect data, and Ben Fleet and Andy Bates for technical advice and Leigh Davis, Landmark Wudinna, for the herbicide pricing information. Thanks to John and Clint Oswald for providing the trial site. |
| Other trial partners | Not specified |
| Crop types | Cereal (Grain): Wheat Weed: Barley Grass |
|---|---|
| Treatment type(s) |
|
| Trial type | Experimental |
| Trial design | Replicated |
| Sow rate or Target density | Scepter wheat was sown @ 65 kg/ha |
|---|---|
| Sowing machinery |
Small plot |
| Sow date | 12 June 2018 |
| Harvest date | Unknown |
| Plot size | 12m x 2m |
| Plot replication | 3 |
| Plot blocking | randomised complete block design with 3 reps x 12 m plots |
| Plot randomisation | randomised complete block design with 3 reps x 12 m plots |
| Fertiliser |
DAP @ 60 kg/ha at sowing |
| Herbicide |
Herbicide treatments were applied using a 2 m shielded sprayer at 2 bar pressure with medium-coarse droplets (T11002 nozzles) and 80 L/ha water rate on 12 June for the pre-emergent herbicides. The post emergent herbicide treatments were applied on 6 July with 6 mm of rainfall after application, and a total of 30 mm for the month of July. |
| Sow rate or Target density | Not specified |
|---|---|
| Sowing machinery | Not specified |
| Sow date | Not specified |
| Harvest date | Not specified |
| Plot size | Not specified |
| Plot replication | Not specified |
| Plot blocking | Not specified |
| Plot randomisation | Not specified |
| Fertiliser | Not specified |
| Herbicide | Not specified |
| # |
Treatment 1
|
Grain yield (t/ha) | Crop Establishment (plants/m2) | Chemical cost ($/ha) | Average barley grass weed density (plants/m2) | Barley grass (heads/m2) (heads/m2) | Barley grass seed head length (cm) |
|---|---|---|---|---|---|---|---|
| 1 | █ Control Untreated | 0.32 e | 178 bc | - | 711 ab | 907 c | 63 |
| 2 | █ Trifluralin (1.5 L/ha) | 0.48 d | 141 b | 9 | 323 bcd | 536 b | 68 |
| 3 | █ Trifluralin (2 L/ha) | 0.56 cd | 153 bc | 12 | 296 bcd | 474 b | 61 |
| 4 | █ Trifluralin (1.5 L/ha) + Diuron 900 (400 g/ha) (pre-emergent) | 0.60 c | 182 bc | 14 | 642 abc | 420 b | 64 |
| 5 | █ Trifluralin (1.5 L/ha) + Avadex (1.6 L/ha) (pre-emergent) | 0.64 c | 107 a | 25 | 189 cde | 579 b | 66 |
| 6 | █ Trifluralin (2 L/ha) + Avadex (1.6 L/ha) + diuron 900 (500 g/ha) (pre-emergent) | 0.63 c | 146 b | 28 | 156 de | 343 ab | 60 |
| 7 | █ Trifluralin (1.5 L/ha) + Boxer Gold (2 L/ha) (pre-emergent) | 0.35 e | 162 bc | 37 | 794 ab | 1089 c | 63 |
| 8 | █ Sakura (118 g/ha) (pre-emergent) | 0.98 ab | 173 bc | 40 | 126 de | 86 a | 64 |
| 9 | █ Sakura (118 g/ha)+ Avadex (3 L/ha) (pre-emergent) | 1.07 a | 158 bc | 70 | 74 ef | 81 a | 58 |
| 10 | █ Boxer Gold (2.5 L/ha) (pre-emergent) | 0.33 e | 203 c | 28 | 1547 a | 893 c | 63 |
| 11 | █ Boxer Gold (2.5 L/ha) (pre-emergent) + Sakura (118 g/ha) (pre-emergent) | 0.93 b | 122 a | 68 | 28 f | 109 a | 65 |
| # |
Treatment 1
|
Grain yield (t/ha) | Crop Establishment (plants/m2) | Chemical cost ($/ha) | Average barley grass weed density (plants/m2) | Barley grass (heads/m2) (heads/m2) | Barley grass seed head length (cm) |
|---|---|---|---|---|---|---|---|
| 1 | █ Control Untreated | 0.32 de | 178 bc | - | 711 ab | 907 c | 58 c |
| 2 | █ Trifluralin (1.5 L/ha) IBS + Lexone (180 g/ha) (post) | 0.16 f | 41 a | 15 | 126 c | 542 ab | 76 c |
| 3 | █ Boxer Gold (2.5 L/ha) (post) | 0.46 b | 150 bc | 28 | 689 a | 532 a | 58 c |
| 4 | █ Glean (20 g/ha) (post) | 0.39 bc | 134 b | 1 | 1213 a | 916 c | 54 bc |
| 5 | █ Monza (25 g/ha) (post) | 0.66 a | 134 b | 10 | 534 b | 426 a | 45 a |
| 6 | █ Crusader (500 ml/ha) (post) | 0.34 cd | 137 bc | 34 | 809 a | 911 c | 49 ab |
| 7 | █ Atlantis (330 ml/ha) (post) | 0.27 e | 147 bc | 29 | 910 a | 782 bc | 57 c |
| Rainfall avg ann (mm) | 325mm |
|---|---|
| Rainfall avg gsr (mm) | 242mm |
| Rainfall trial total (mm) | 268mm |
| Rainfall trial gsr (mm) | 208mm |
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to
construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol
16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.
