The effect of combinations of crop row spacing, seedbed utilisation and pre-emergence herbicides on ryegrass management in barley

2019

Research organisations
Funding source

Trial details

Researcher(s) Amanda Cook
Ben Fleet
Gurjeet Gill
Neil king
Ian Richter
Year(s) 2019
Contributor SARDI Minnipa Agricultural Centre
Trial location(s) Minnipa, SA
Related trials
The effect of combinations of crop row spacing, seedbed utilisation and pre-emergence herbicides on ryegrass management in barley locations
Aims

The effect of combinations of crop row spacing, seedbed utilisation and preemergence herbicides on ryegrass management in barley

Key messages
  • The herbicide treatment had a significant effect on annual ryegrass (ARG) plant density. Trifluralin only reduced ARG spike density by 20% compared to the untreated control, whereas Boxer Gold caused a 73% reduction in ARG spike density.
  • Barley sown on 25 cm row spacing resulted in a 38% less ARG seed production compared to the 37.5 cm row spacing treatment.
  • Barley sown using the splitter seed boot treatment had 32% lower ARG seed production than the narrow seed boot treatment.
  • It was still profitable to control ARG with effective herbicide treatments. Based on cash grain price of feed barley of $250/t in 2019, Trifluralin would be expected to increase the gross margin by $32/ha as compared $71/ha increase for Boxer Gold.
Minnipa SA 2019 Barley

Trial design split plot design with 4 replicates

Lead research organisation School of Agriculture, Food and Wine - The University of Adelaide
Host research organisation School of Agriculture, Food and Wine - The University of Adelaide
Trial funding source GRDC 9175134
Related program N/A
Acknowledgments

The authors thank Bruce and Kathryn Heddle for hosting the site. Malinee Thongmee and Hue Thi Dang (University of Adelaide), Fiona Tomney, Steve Jeffs, Bradley Hutchings and Katrina Brands (SARDI) for their technical input to the trial. We also acknowledge the investment from GRDC for the research into ‘Cultural management for weed control and maintenance of crop yield’ (9175134).


Other trial partners SARDI Minnipa Agricultural Centre
Download the trial report to view additional trial information

Method

Crop types Cereal (Grain): Barley Weed: Ryegrass
Treatment type(s)
  • Herbicide : Timing
  • Herbicide : Type
  • Sowing : Row Spacing
Trial type Experimental
Trial design Randomised,Replicated

Minnipa 2019 Barley

Sow rate or Target density 180 seeds/m2
Sow date 20 May 2019
Harvest date Unknown
Trial design method SPD Split Plot Design
Plot size 1.5m x 10m
Plot replication 4
Plot randomisation N
Fertiliser

At sowing – DAP (18:20:0:0) @ 60 kg/ha

Minnipa 2019 Ryegrass

Sow rate or Target density Not specified
Sow date Not applicable
Harvest date Not applicable
Trial design method SPD Split Plot Design
Plot size 1.5m x 10m
Plot replication 4
Plot randomisation Y
Fertiliser Not specified
Download the trial report to view additional method/treatment information

Download results

Trial source data unavailable: Trial may be in progress or trial results have not been recorded.

Trial results Key management operations undertaken at Minnipa trial site in 2019.

# Treatment 1
Treatment 2
1 Operation Details
2 Location Minnipa, SA
3 Seedbank soil cores 11 April
4 Plot size 1.5 m x 10 m
5 Seeding date 20 May
6 Fertiliser At sowing – DAP (18:20:0:0) @ 60 kg/ha
7 Variety Compass barley
8 Seeding rate 180 seeds/m2
9 Herbicides 20 May (applied just before seeding) Trifluralin 1.5 L/ha IBS Boxer Gold 2.5 L/ha IBS Control (knockdown treatment only)
10 Trial design split plot design with 4 replicates
11 Measurements: pre-sowing weed seedbank, crop density, weed density, ARG spike density, ARG seed production, wheat grain yield
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Minnipa, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Minnipa, SA Calcarosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Minnipa SA
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Climate

Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Minnipa SA

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Some data on this site is sourced from the Bureau of Meteorology

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.

Trial report and links

2019 trial report



Trial last modified: 08-10-2025 00:48am AEST