The contribution of nitrogen fertilizer timing and placement in reducing the growth and seed production of ryegrass (Lolium rigidum Gaudin) in competition with wheat (Triticum aestivum L.).

2019

Research organisatons
Funding source

Trial details

Researcher(s) Mike Ashworth
Contact email mike.ashworth@uwa.edu.au
Year(s) 2019
Contributor School of Agriculture and Environment - The University of Western Australia
Trial location(s) York WA, WA
The contribution of nitrogen fertilizer timing and placement in reducing the growth and seed production of ryegrass (Lolium rigidum Gaudin) in competition with wheat (Triticum aestivum L.). locations
Aims

This trial was located in York in the grainbelt of Western Australia and investigated combinations of UAN (Urea Ammonium Nitrate) Placement (streamed or broadcast), UAN rate (low and high input) and UAN timing (early or late in the crop growth) for management of ARG.

Key messages

Whilst the streaming of UAN modestly reduced annual ryegrass (ARG) N percentage in the tissue, no difference in annual ryegrass seed production was evident. Due to the dry conditions in 2019, the application of supplementary UAN did not significantly increase wheat canopy closure or yield. Interestingly, UAN placement did affect the total nitrogen uptake in the ryegrass population, potentially increasing ARG competitiveness. Banding UAN to the crop row was found to increase ARG N uptake. As seeding systems provide herbicide free bands on otherwise herbicide treated soil for safe wheat establishment it was found that the majority of ARG emerged from these crop rows. Concentrating N applications to these regions may have inadvertently increased the N uptake in ARG. This study was conducted in York over the 2018 and 2019 seasons. A multi- environment trial analysis for the combined data to be completed.

Lead research organisation Australian Herbicide Resistance Initiative
Host research organisation N/A
Trial funding source GRDC 9175962
Related program N/A
Acknowledgments

This research was funded by the Grains Research Development Corporation of Australia (GRDC).


Other trial partners Living Farm
Download the trial report to view additional trial information

Method

Crop types Cereal (Grain): Wheat Weed: Ryegrass
Treatment type(s)
  • Fertiliser: Application Method
  • Fertiliser: Timing
Trial type Experimental
Trial design Blocked

York WA 2019 Wheat

Sow date 27 May 2019
Harvest date Unknown
Plot size Not specified
Plot replication Not specified

York WA 2019 Ryegrass

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
York WA, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
York WA, WA Sodosol
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 York WA WA
2019 116.3mm
2018 182.6mm
2017 208.4mm
2016 161.8mm
2015 140.0mm
2014 159.4mm
2013 172.3mm
2012 184.9mm
2011 201.6mm
2010 187.8mm
2009 241.4mm
2008 220.0mm
2007 198.4mm
2006 190.6mm
2005 179.5mm
2004 178.2mm
2003 190.5mm
2002 144.6mm
2001 175.5mm
2000 282.9mm
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

Derived climate information

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

York WA 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: 20-03-2023 15:22pm AEST