Oat agronomy - response to applied nitrogen and plant density at Merredin


Research organisaton
Funding sources

Trial details

Researcher(s) Georgie Troup, Mark Seymour and Raj Malik
Year(s) 2016
Contributor Department of Agriculture and Food WA
Trial location(s) Site 4, Merredin, WA
Oat agronomy - response to applied nitrogen and plant density at Merredin locations
  • To compare the responses of four oat varieties to changes in nitrogen rate.
  • To compare the responses of four oat varieties to changes in seeding rates.
  • To determine if there are significant variety x nitrogen x seeding rate interactions.
  • To provide information on the responsiveness of new varieties to management and the consequences for grain yield, grain quality, hay yield, hay quality, and overall agronomic performance.
  • To develop management guidelines for growers and the industry on new oat varieties.
Key messages
  • Varieties differ in their yield, quality and response to changes in plant density. 
  • Bannister  was the best performing variety in 2016 as it out-yielded the other varieties evaluated and met Oat1 quality standards at all sites. However, Bannister  should be sown to achieve a higher plant density than Carrolup.
  • Grain quality of newly released, short season variety Durack  was not consistent with previous studies.  
  • Choosing to grow more than one variety will maximise the strengths, and mitigate the weaknesses of oat varieties.
Lead research organisation Department of Agriculture and Food WA
Host research organisation N/A
Trial funding source DAFWA DAW00227
Trial funding source GRDC DAW00227
Related program Oat agronomy and industry development in the Western Region

I would like to acknowledge the research support of Blakely Paynter, and technical support of Helena O’Dwyer, Pam Burgess and Rod Bowey and the DAFWA Research Support Units at Northam, Merredin, Esperance and Katanning.

The research undertaken as part of this project is made possible by the significant contributions of growers through both trial cooperation and the support of the GRDC, the author would like to thank them for their continued support.

Other trial partners Not specified
Download the trial report to view additional trial information


Crop type Oats
Treatment type(s)
  • Fertiliser: Rate
  • Sowing: Rate
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Merredin 2016

Sow rate or Target density The seed rate (kg/ha) to establish the four target plant densities of 80, 160, 240 and 320 plants/m2 varied for each variety and was adjusted based on their grain weight and germination percentage. A seed rate of 80 plants/m2 = 27 to 36kg/ha, 160 plants/m
Sowing machinery

Small plot air-seeder with on-row packing press wheels. 

Sow date 28 April 2016
Harvest date 3 November 2016
Plot size 10m x 1.85m
Plot replication 3
Paddock history Sown into canola stubble.

Basal fertiliser comprised of Summit GUSTO compound fertiliser which was treated with Uniform (40ml/L) and banded below the seed at 100kg/ha, supplying a total of 10kg N/ha, 12kg P/ha and 14kg K/ha.

Seed treatment Seed was treated with Emerge and Vibrance at label rate.
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
Site Depth Type pH EC P K N A OC CAT
Site 4, Merredin, WA 0 - 10cm Brown sandy duplex 5.00 0.86
Soil conditions
Trial site Soil texture
Site 4, Merredin, WA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 4, Merredin, WA Sodosol
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



Site 4, Merredin WA 2016

Observed climate information

Rainfall trial gsr (mm) 225mm

Derived climate information

Site 4, Merredin WA


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: 09-07-2018 15:59pm AEST