Variable urea rates on sandy loam and deep sand


Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA), Tim Moyle (Landmark Kimba), Linden Masters (MAC), Leigh Davis and Brenton Spriggs (SARDI), Linden Masters (FSG)
Year(s) 2011
Contributor Society of Precision Agriculture Australia
Trial location(s) Site 4, Kimba, SA
Variable urea rates on sandy loam and deep sand locations
  • To compare the effects of variable urea rate on two soil types.
  • To compare different rates of urea applied at GS30.
Key messages

Additional N did not have an economic advantage in this season. Paddock and demonstration site suffered from the dry 6 weeks period mid season. Stem rust devastated potential 3 ton crop reducing yield by 50%. This combination resulted in poor yields, low test weight and high screenings. Good soil showed improved protein over deeper sand regardless of extra N applied. Extra N marginally improved protein but not enough economically to apply more.

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) and run in conjunction with Eyre Peninsula Farming Systems 3

Other trial partners The Soaks' property owners Dion, Bert, & Barb Woolford. Paddock and trial sown by Dion Woolford
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Crop type Wheat
Treatment type(s)
  • Fertiliser: Rate
  • Soil: Type
Trial type Precision agriculture
Trial design Not applicable

Kimba 2011

Sow rate or Target density 50kg/ha, 110 plants/m2
Sow date 30 May 2011 End of May
Harvest date Not specified
Plot size 2m x 20m
Plot replication Not specified

At sowing: 50 kg 18:20. Then 50, 100 and 200 kg urea hand spread at GS31

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Download results

Trial results Table 1

# Treatment 1
Protein (%) Grain yield (t/ha) Test weight (kg/hL) Screenings (%) Moisture (%)
1 Sandy loam with 0kg/ha urea 10.4 1.71 66.4 13.1 11.3
2 Sandy loam with 50kg/ha urea 11.2 1.64 70.2 9.4 11.4
3 Sandy loam with 100kg/ha urea 11.5 1.71 68.1 9.2 11.3
4 Sandy loam with 200kg/ha urea 12.5 1.7 71.6 8.7 11.1
5 Deep sand with 0kg/ha urea 10.1 1.49 59.8 14.1 11.4
6 Deep sand with 50kg/ha urea 10.3 1.64 63.4 15 11.5
7 Deep sand with 100kg/ha urea 10.6 1.51 68.8 7.6 11.6
8 Deep sand with 200kg/ha urea 10.9 1.48 73.4 8.6 11.3

Grain yield t/ha


Moisture %


Protein %


Screenings %


Test weight kg/hL

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 4, Kimba, SA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 4, Kimba, 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.

Site 4, Kimba 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.

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Trial last modified: 30-09-2019 16:17pm AEST