Overcoming the obstacles in setting up variable rate: a first time user with a shared learning experience

CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA)
Neil McMillan (Central West PA Group Facilitator)
Year(s) 2010
Contributor Society of Precision Agriculture Australia
Trial location(s) Forbes, NSW
Overcoming the obstacles in setting up variable rate: a first time user with a shared learning experience locations

To overcome the challenges in setting up variable rate controllers

Key messages

The objective of this GRDC / SPAA funded project is to increase the level of adoption of PA 'beyond guidance' by broadacre farmers. The project specifically aims to increase the level of adoption of variable rate (VR) by growers in the project to 30% by 2013.This goal will be achieved by demonstrating how to use PA tools to growers at a regional level and by increasing the skills of growers and industry in PA to a level where they can then use PA tools in their farming systems to achieve economic, environmental and social benefits.

Lead research organisation Society of Precision Agriculture Australia
Host research organisation N/A
Trial funding source GRDC SPA000010
Related program N/A

Matt and John Duff (property owners), Neil McMillan CWFS, Leighton Wilksch (SPAA group facilitator) Ian Packer - Lachlan CMA.The project was funded by the GRDC

Other trial partners GRDC
Download the trial report to view additional trial information


Crop type Wheat
Treatment type(s)
  • Fertiliser: Rate
Trial type Article/commentary
Trial design Not applicable

Forbes 2010

Sow date 3 May 2010 3 May 2010
Harvest date Not specified
Plot size Not specified
Plot replication Not specified


Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

@T1: water
# Treatment 1
Soil nitrate (mg/kg) Electrical conductivity (dS/m) Colwell phosphorus (mg/kg) pH (value)
1 NVDI Zone - High 20 0.09 62 5.8
1 NVDI Zone - High 18 0.14 78 7.1
2 NVDI Zone - High 15 0.27 51 5.4
2 NVDI Zone - Medium 15 0.09 91 6.3
3 NVDI Zone - Medium 13 0.06 37 6.4
3 NVDI Zone - Medium 13 0.09 35 7.3
4 NVDI Zone - Low 12 0.09 55 5.8
4 NVDI Zone - Low 23 0.08 56 5.1
5 NVDI Zone - Low 14 0.08 56 6.5

Colwell phosphorus mg/kg


Electrical conductivity dS/m


pH value


Soil nitrate mg/kg

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Forbes, NSW Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Forbes, NSW 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 Forbes NSW
2010 600.9mm
2009 510.5mm
2008 467.1mm
2007 424.4mm
2006 469.2mm
2005 503.6mm
2004 459.3mm
2003 414.7mm
2002 442.2mm
2001 467.9mm
2000 439.0mm
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.

Forbes NSW

NOTE: Exact trial site locality unknown - Climate data may not be accurate

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 last modified: 23-09-2019 19:39pm AEST