Wheat seed rate trial

CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA)
Craig Jaeschke (SPAA)
Grant Jaeschke (SPAA)
Sam Trengove (Trengrove Consulting)
Leighton Wilksch (Landmark)
Year(s) 2010
Contributor Society of Precision Agriculture Australia
Trial location(s) Clare, SA
Wheat seed rate trial locations
  • To compare the effects of seed rate on ryegrass competition.
  • To assess the potential of zone management of fertiliser and other inputs.
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)
  • Sowing: Rate
Trial type Precision agriculture
Trial design Not applicable

Clare 2010

Sow rate or Target density 70, 90 and 120kg/ha
Sowing machinery

49 ha plot sozw

Sow date 14 May 2010 14 May 2010
Harvest date Not specified
Plot size Not specified
Plot replication Not specified

N fertiliser applied at constant 15 kg/ha across all treatments

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Treatment 2
Head abundance (heads/m2)
1 High yield zone sown @ 70kg seed/ha Ryegrass 230
2 High yield zone sown @ 12kg seed/ha Ryegrass 162
3 High yield zone sown @ 70kg seed/ha Wheat 500
4 High yield zone sown @ 12kg seed/ha Wheat 533

Head abundance heads/m2

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Clare, SA Heavy clay (black)
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Clare, SA Chromosol
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 Clare SA
2010 547.5mm
2009 550.5mm
2008 527.0mm
2007 538.0mm
2006 519.3mm
2005 546.5mm
2004 520.6mm
2003 537.2mm
2002 509.4mm
2001 539.9mm
2000 489.0mm
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.

Clare SA


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: 30-09-2019 16:22pm AEST