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) Dr Mike Ashworth
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 study determines the effect of N fertilizer placement, N fertiliser rate and N application timing on the competitive ability of wheat (Triticum aestivum L.) in dryland no-tillage cropping system in the Western Australian grainbelt.

Key messages

The results of this study suggests:

  • Whilst the streaming of UAN modestly reduced annual ryegrass N percentage in the tissue, no difference in annual ryegrass biomass or seed production was evident.
  • Nitrogen placement did not affect Wheat biomass accumulation (NDVI results), however modest differences in Canopy closure percentage existed. UAN rate and timing however had a greater effect on wheat biomass (NDVI results and wheat biomass cut) and percent canopy closure.
  • UAN rate, UAN timing (plus interaction of UAN timing and placement) were found to have significantly affected Radiation interception of the crop in the absence of weeds.
  • Nitrogen placement affected the yield and protein content of the grain produced.
Lead research organisation Australian Herbicide Resistance Initiative
Host research organisation Australian Herbicide Resistance Initiative
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 University of Adelaide
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Method

Crop type Wheat
Treatment type(s)
  • Fertiliser: Timing
  • Fertiliser: Application
  • Sowing: Rate
Trial type Experimental
Trial design Randomised

York WA 2019

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
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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
Trial site Soil order
York WA, WA Anthroposol
National soil grid Source
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.




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Trial last modified: 22-05-2019 10:55am AEST