| Researcher(s) |
Catherine Borger Amy Bowden David Minkey |
|---|---|
| Contact email | catherine.borger@dpird.wa.gov.au |
| Contact phone | +61467816082 |
| Year(s) | 2020 - 2021 |
| Contributor | Department of Primary Industries and Regional Development WA |
| Trial location(s) |
Wickepin, WA
|
| Related trials |
|
Barley grass is becoming an increasingly problematic weed in Western Australia. A GRDC funded project sought to increase the adoption of integrated weed management tactics for barley grass, by working with grower groups to develop regionally appropriate rotations for optimal control.
Barley grass at high density reduces crop yield. However, GRDC project UA00156 (Seed bank ecology of emerging weeds) has highlighted that barley grass ecotypes in Western Australia are often short, and are likely to be highly sensitive to crop competition. Initial control with pre-emergent herbicides combined with high seeding rates in cereal crops may be sufficient to control this species.
This trial aimed to investigate pre-emergent herbicides and high-density crop seeding in barley crops. The trial was run in two separate fields in 2020 and 2021, on a single farm.
Triflur X® provided excellent control of barley grass over the entire site, although by August, weed density was lower following Triflur X® at 3L/ha rather than 2L/ha.
In 2020, Intervix® provided excellent control in-crop, preventing panicle production. In 2021 the field was too wet to spray in-crop herbicides.
Increased seeding rate increased crop density, and resulted in a non-significant reduction to barley grass panicles.
Barley grass had lower density, panicles and seed production in plots with Triflur X® at 3L/ha rather than 2L/ha.
Intervix® reduced barley grass density and prevented barley grass panicle and seed production.
Crop density increased with increasing seeding rate, and resulted in a non-significant reduction in barley grass seed production.
As expected, crop density increased with seeding rate, and increased crop density reduced barley grass density (6.8, 2.3 and 2.5 barley grass/m2). Triflur X® gave excellent initial barley grass control in all treatments.
Due to the very wet season, it was not possible to apply the Intervix® treatment, and barley grass cohorts emerged later in the season. As a result, by the end of the season there was no significant difference in panicle and seed number. However, there was a consistent trend of reduced barley grass panicles or seeds at the higher sowing rate.
| Lead research organisation |
Department of Primary Industries and Regional Development WA |
|---|---|
| Host research organisation |
Facey Group |
| Trial funding source | GRDC UOA1903-004SAX |
| Trial funding source | DPIRD WA |
| Related program |
Demonstrating and validating the implementation of integrated weed management strategies to control barley grass in the low rainfall zone farming system |
| Acknowledgments |
We would like to thank Gary Lang for providing the trial site and running the trial, FACEY and WANTFA for designing and managing the trial and Chris Hetherington (FACEY) and Nerys Wilkins (DPIRD) for assistance with trial measurements. |
| Other trial partners | WANTFA |
| Crop type | Cereal (Grain): Barley |
|---|---|
| Treatment type(s) |
|
| Trial type | |
| Trial design |
| Sow rate or Target density | 40, 80 or 120kg/ha |
|---|---|
| Sow date | 3 June 2020 |
| Harvest date | 30 November 2020 |
| Plot size | 12m x 200m |
| Plot replication | 3 |
| Plot blocking | Yes |
| Plot randomisation | Randomised block design |
| Fertiliser |
3 June 2020. MAP (mono-ammonium phosphate) 60kg/ha, UAN (liquid nitrogen) 50L/ha, CuZn mix 1L/ha, azoxystrobin 250 SC 0.4L/ha 8 July 2020. Flexi N 50L/ha 17 July 2020. Flexi N 48L/ha |
| Herbicide |
Main plot treatments
Subplot treatments
9 April 2020. Garlon® 0.1L/ha, 2,4-D ester 0.3L/ha, wetter 0.14L/ha, oil 0.35L/ha. 21 May 2020. Glyphosate 450 CT 2L/ha. 3 June 2020. Triflur X® 480 2 or 3L/ha, Gramoxone® 250 1.5L/ha, oil 0.35L/ha. 8 July 2020. Intervix® 0.375L/ha, Tilt 625 0.1L/ha, Alpha Forte 0.05L/ha, Hasten 0.4L/ha. |
| Sow rate or Target density | 40, 80 or 120kg/ha |
|---|---|
| Sow date | 3 June 2021 |
| Harvest date | 27 December 2021 |
| Plot size | Not specified |
| Plot replication | Not specified |
| Plot blocking | Not specified |
| Plot randomisation | Not specified |
| Fertiliser | Not specified |
| Herbicide |
Main plot treatments
The original plan included Intervix® in-crop. It could not be sprayed due to very wet conditions. 25 March 2021. Ally® 3g/ha, Garlon® 0.08L/ha, glyphosate 450 1.5L/ha, 2,4-D ester 600 0.4L/ha, EnhanceTM 0.3L/ha. 2 June 2021. Glyphosate 450 2.6L/ha, EnhanceTM 0.3L/ha. 3 June 2021. Triflur X® 480 2 or 3L/ha, Gramoxone® 250 2L/ha, oil 0.35L/ha.
|
| # |
Treatment 1
|
Treatment 2
|
Barley grass panicles (heads/ha) | Barley grass density (plants/ha) | Barley grass seeds (seeds/ha) |
|---|---|---|---|---|---|
| 1 | █ Triflur X® 2L/ha | █ | 6917 | 3989 | 38903 |
| 2 | █ Triflur X® 2L/ha | █ Intervix® | 0 | 2 | 0 |
| 3 | █ Triflur X® 3L/ha | █ | 467 | 3695 | 1317 |
| 4 | █ Triflur X® 3L/ha | █ Intervix® | 0 | 25 | 0 |
| # |
Treatment 1
|
Treatment 2
|
Barley grass panicles (heads/m2) | Barley grass density (plants/m2) | Barley grass seeds (seeds/m2) |
|---|---|---|---|---|---|
| 1 | █ 40kg/ha | █ Triflur X® 2L/ha | 98.7644 | 16 | 2708.24 |
| 2 | █ 80kg/ha | █ Triflur X® 2L/ha | 59.2587 | 5 | 1049.78 |
| 3 | █ 120kg/ha | █ Triflur X® 2L/ha | 49.3822 | 6 | 930.299 |
| 4 | █ 40kg/ha | █ Triflur X® 3L/ha | 95.6781 | 10 | 2498.16 |
| 5 | █ 80kg/ha | █ Triflur X® 3L/ha | 45.0613 | 6 | 734.373 |
| 6 | █ 120kg/ha | █ Triflur X® 3L/ha | 36.4194 | 6 | 611.867 |
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.
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Some crop varieties used in research trials may be covered by Plant Breeders' Rights (PBR). Users should confirm PBR status of relevant varieties by searching the IP Australia PBR database, http://pericles.ipaustralia.gov.au/pbr_db/ or Variety Central (http://varietycentral.com.au/) and contacting variety owners for further information if required. Where possible, varieties have been listed according to their registered PBR name, although OFT cannot and does not guarantee that the information is accurate or complete.
Note that PBR cover is administered through the Plant Breeders’ Right Act 1994 (