Pre-emergent herbicides and high density crop for annual ryegrass grass control

2019

Research organisatons
Funding source

Trial details

Researcher(s) Catherine Borger (DPIRD)
David Minkey (WANTFA)
Contact email catherine.borger@dpird.wa.gov.au
Contact phone 0467816082
Year(s) 2019
Contributor Department of Primary Industries and Regional Development WA
Trial location(s) Dalwallinu, WA
Pre-emergent herbicides and high density crop for annual ryegrass grass control locations
Aims

Annual ryegrass at high density reduces crop yield. However, this weed is 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.

The trial aims to investigate pre-emergent herbicides and high density crop seeding in a wheat crop.

Key messages

Increased crop density reduced annual ryegrass density.

Herbicides offered effective weed control, and performance of Sakura® and Boxer Gold® was similar in this season.

Dalwallinu WA 2019 Wheat

Main plot treatments​​​​:

No herbicide

Sakura® 118 g/ha pre-seeding

Boxer Gold® 2.5 L/ha pre-seeding

Boxer Gold® 1.25 L/ha pre-seeding and 1.25 L/ha post-emergent

Boxer Gold® 2.5 L/ha + Sakura® 118 g/ha pre-seeding

Sub-plot treatments:

Mace wheat at 45 or 90 kg/ha

 

 

Lead research organisation Western Australia No-tillage Farmers Association
Host research organisation Department of Agriculture and Food WA
Trial funding source GRDC UOA1903-004SAX
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 Dustyn Fry for providing the trial site and running the trial, and staff at WANTFA for assistance with trial management.


Other trial partners University of Adelaide
Download the trial report to view additional trial information

Method

Crop types Weed: Ryegrass Cereal (Grain): Wheat
Treatment type(s)
  • Sowing: Rate
Trial type
Trial design

Dalwallinu 2019 Ryegrass

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

Dalwallinu 2019 Wheat

Sow rate or Target density 45 or 90 kg/ha
Sowing machinery

Knife points and press wheels, 25 cm row spacing.

Sow date 14 June 2019
Harvest date 29 November 2019
Plot size 36m x 1200m
Plot replication 2
Plot blocking 2
Plot randomisation Split plot design
Fertiliser

80 kg/ha Agras

50 L/ha Flexi N

Herbicide

Glyphosate 2 L/ha over the whole trial area.

 

Main plot treatments​​​​

No herbicide

Sakura® 118 g/ha pre-seeding

Boxer Gold® 2.5 L/ha pre-seeding

Boxer Gold® 1.25 L/ha pre-seeding and 1.25 L/ha post-emergent

Boxer Gold® 2.5 L/ha + Sakura® 118 g/ha pre-seeding

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1. Annual ryegrass density following application of pre-emergent herbicides at wheat seeding rates of 45 or 90 kg/ha.

# Treatment 1
Treatment 2
Ryegrass density (plants/m2)
1 45 No herbicide 327
2 45 Sakura® 118 g/ha pre-seeding 42
3 45 Boxer Gold® 2.5 L/ha pre-seeding 65
4 45 Boxer Gold® 1.25 L/ha pre-seeding and 1.25 L/ha post-emergent 68
5 45 Boxer Gold® 2.5 L/ha + Sakura® 118 g/ha pre-seeding 37
6 90 No herbicide 274
7 90 Sakura® 118 g/ha pre-seeding 21
8 90 Boxer Gold® 2.5 L/ha pre-seeding 22
9 90 Boxer Gold® 1.25 L/ha pre-seeding and 1.25 L/ha post-emergent 26
10 90 Boxer Gold® 2.5 L/ha + Sakura® 118 g/ha pre-seeding 29

Ryegrass density plants/m2


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Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Dalwallinu, WA Sandy loam
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Dalwallinu, WA Tenosol
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 Dalwallinu WA
2019 106.4mm
2018 146.5mm
2017 108.3mm
2016 144.2mm
2015 183.2mm
2014 117.4mm
2013 137.5mm
2012 154.1mm
2011 155.7mm
2010 117.9mm
2009 148.3mm
2008 182.9mm
2007 151.5mm
2006 135.2mm
2005 123.1mm
2004 110.8mm
2003 112.6mm
2002 68.2mm
2001 75.7mm
2000 172.5mm
National soil grid Source: CSIRO/TERN
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties

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Climate

Dalwallinu WA 2019


Observed climate information

Rainfall avg ann (mm) 347mm
Rainfall avg gsr (mm) 272mm
Rainfall trial total (mm) 182mm
Rainfall trial gsr (mm) 172mm

Derived climate information

Dalwallinu WA

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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: 17-03-2023 09:31am AEST