Variable rate phosphorus


Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA), SA Training &, Consulting, 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
Trial site Soil order
Township, SA Calcarosol
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



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.

Individual Trial Project data and information and OFT metadata are licensed under a Creative Commons Attribution 4.0 International License.
The data and information accessed through OFT may also be subject to Terms of Use specified by the Trial Contributor,
in which case the Terms of Use of a Trial Contributor take precedence over other information provided on OFT.
Trial last modified: 30-09-2019 16:14pm AEST