Can adjusting zones within N1 paddock at Minnipa improve VRT outcomes?


Research organisaton
Funding source

Trial details

Researcher(s) Roy Latta (SARDI)
Cathy Paterson (SARDI)
Ian Richter (SARDI)
Wade Shepperd (Precision Ag Services)
Peter Treloar (Precision Ag Services)
Year(s) 2011
Contributor SARDI Minnipa Agricultural Centre
Trial location(s) Minnipa Agricultural Centre, SA
Can adjusting zones within N1 paddock at Minnipa improve VRT outcomes? locations

To study the use of VRT through zoning the paddock based on pre-2008 yield monitor maps, and incorporating EM38 and elevation maps.

Key messages
  • Compared to 2008 map, rezoning based on 2009 yield monitor map improved variable rate technology (VRT) performance in 2009, 2010 and 2011 seasons.
  • The highest gross margin was returned from paddock N1 as a result of zoning whereby no fertiliser was being applied to 89% of the paddock.
  • A limited yield response to applied fertiliser has restricted any gross margin benefit from the VRT technology from this paddock with high soil P reserves.
Lead research organisation SARDI Minnipa Agricultural Centre
Host research organisation N/A
Trial funding source GRDC UA00107
Related program Eyre Peninsula Farming Systems
  • We acknowledge the funding from GRDC project UA00107 for this work. Special thanks to Mark Klante, Brett McEvoy and Trent Brace for their assistance sowing and managing the trial and also Therese McBeath for reviewing this article and all her advice during the year.

Other trial partners UoA and CSIRO
Download the trial report to view additional trial information


Crop type Barley
Treatment type(s)
  • Fertiliser
  • Sowing: Rate
Trial type Demonstration
Trial design Replicated

Minnipa Agricultural Centre 2011

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
Minnipa Agricultural Centre, SA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Minnipa Agricultural Centre, 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 Agricultural Centre SA
2011 370.8mm
2010 361.5mm
2009 368.6mm
2008 286.4mm
2007 291.5mm
2006 325.4mm
2005 292.1mm
2004 289.8mm
2003 302.0mm
2002 301.6mm
2001 343.8mm
2000 351.6mm
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



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 Agricultural Centre SA


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

SILO weather estimates sourced from
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 last modified: 21-01-2019 14:44pm AEST