Variable urea rates on sandy loam and deep sand


Research organisaton
Funding sources

Trial details

Researcher(s) Nicole Dimos (SPAA) and Linden Masters (EP Farming Systems)
Year(s) 2011
Contributor Society of Precision Agriculture Australia
Trial location(s) Site 5, 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
Trial funding source SPAA
Related program N/A

“The Soaks” property owners Dion, Bert Barb Woolford. Paddock and trial sown by Dion Woolford. Tim Moyle Landmark Kimba pegged trials and applied urea. Linden Masters MAC monitored plots and interpreted results. Leigh Davis and Brenton Spriggs SARDI reapt plots. Trials coordinator and FSG contact is Linden Masters

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

Kimba 2011

Sow rate or Target density 50kg/ha
Sow date End of May
Harvest date Not specified
Plot size 2m x 20m
Plot replication Not specified

50kg 18:20 at sowing; Control, 50kg, 100kg and 200kg urea hand spread at GS31

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Download results

Trial results Table 1

# Treatment 1
Treatment 2
Protein (%) Grain yield (t/ha) Test weight (kg/hL) Screenings (%) Moisture (%)
1 Sandy loam Urea @ 0 kg/ha 10.4 1.71 66.4 13.1 11.3
2 Sandy loam Urea @ 50 kg/ha 11.2 1.64 70.2 9.4 11.4
3 Sandy loam Urea @ 100 kg/ha 11.5 1.71 68.1 9.2 11.3
4 Sandy loam Urea @ 200 kg/ha 12.5 1.7 71.6 8.7 11.1
5 Deep sand Urea @ 0 kg/ha 10.1 1.49 59.8 141 11.4
6 Deep sand Urea @ 50 kg/ha 10.3 1.64 63.4 15 11.5
7 Deep sand Urea @ 100 kg/ha 10.6 1.51 68.8 7.6 11.6
8 Deep sand Urea @ 200 kg/ha 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 5, Kimba, SA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 5, 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 5, 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 16:18pm AEST