Variable rate phosphorus

CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA)
Felicity Turner (Vision Ag)
Year(s) 2010
Contributor Society of Precision Agriculture Australia
Trial location(s) Township, SA
Variable rate phosphorus locations

To compare the effects and demonstrate the economic benefits that may result from the use of variable rate phosphorus applications by broad acre farmer trial.

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

This project was funded by the Grains Research and Development Corporation (GRDC)

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


Crop type Wheat
Treatment type(s)
  • Fertiliser: Rate
Trial type Precision agriculture
Trial design Not applicable

Township 2010

Sowing machinery

3.8 ha plot size

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

DAP, Urea

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Grain copper (mg/kg) Grain manganese (mg/kg) Grain yield (t/ha) Grain zinc (mg/kg)
1 Zone 1 (Low yielding) - Rate 1 @ 26kg/ha DAP + 22kg/ha Urea 3.26 15.61 2.427 1.8
2 Zone 1 (Low yielding) - Rate 2 @ 55kg/ha DAP + 11kg/ha Urea 4.38 18.56 2.558 1.68
3 Zone 1 (Low yielding) - Rate 3 @ 83kg/ha DAP + 0kg/ha Urea 2.78 16.29 2.565 1.49
4 Zone 2 (High yielding ) - Rate 1 @ 26kg/ha DAP + 22kg/ha Urea 2.39 13.3 2.499 1.48
5 Zone 2 (High yielding) - Rate 2 @ 55kg/ha DAP + 11kg/ha Urea 2.39 13.4 2.597 1.38
6 Zone 2 (High yielding) - Rate 3 @ 83kg/ha DAP + 0kg/ha Urea 2.89 15.16 2.9 1.31

Grain yield t/ha


Grain copper mg/kg


Grain manganese mg/kg


Grain zinc mg/kg

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Township, SA Brown sandy loam over clay
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Township, 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 Township SA
2010 587.3mm
2009 524.0mm
2008 512.1mm
2007 533.6mm
2006 577.8mm
2005 601.2mm
2004 564.4mm
2003 559.5mm
2002 522.9mm
2001 519.2mm
2000 509.4mm
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.

Township SA

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
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: 30-09-2019 16:14pm AEST