Best bet management of ameliorated non-wetting soils of the Geraldton Port Zone - Irwin


Research organisatons
Funding source

Trial details

Researcher(s) Debbie Gillam, Mingenew-Irwin Group
Year(s) 2017
Contributor Liebe Group
Trial location(s) Irwin, WA
Best bet management of ameliorated non-wetting soils of the Geraldton Port Zone - Irwin locations

To determine the best way to apply nutrients and increase nutrient uptake on non-wetting soils after amelioration in the Geraldton port zone.

Key messages
  • The treatment plots with low or no potassium were observed to have less vigour (visual assessment) and plant density from emergence.
  • High potassium treatments had lower screenings and higher yields independent of the rate of nitrogen applied.


Lead research organisation N/A
Host research organisation Grains Research and Development Corporation
Trial funding source GRDC LIE00010-A
Related program N/A

Many thanks to the Department of Industries and Regional Development (DPIRD) for their assistance with trial management, CSBP for technical support and, the Kelly Family for the site and assistance.

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


Crop type
Treatment type(s)
  • Fertiliser: Application
Trial type Experimental
Trial design Replicated

Irwin 2017

Sow rate or Target density 80 kg/ha
Sow date 16 May 2017 16th May 2017
Harvest date Not specified
Plot size 2m x 20m
Plot replication 4
Paddock history 2013: Wheat 2014: Lupins 2015: Wheat 2016: Lupins
Fertiliser <p>16/05/2017: Seeding fertiliser as per treatment list</p> <p>17/07/2017: 50 L/ha Flexi N</p>
Herbicide <p>16/05/2017: 118 gm/ha Sakura, 1.5 L/ha Trifluralin</p> <p>17/07/2017: 800 ml/ha Jaguar</p>
Insecticide <p>16/05/2017: 200 ml/ha Lorsban,&nbsp;200 ml/ha Dominex</p>
Other trial notes <p>For further information, contact Debbie Gillam, Mingenew Irwin Group<br /><br /> 0427 281 006</p>
Download the trial report to view additional method/treatment information

Trial results Table 1

# Variety
Returns ($/ha) Plant density (plants/m2) Screenings (%) Grain yield (t/ha) Hectolitre weight (kg/hL) Protein (%)
1 Std N no K 113 46 8.7 0.45 69.5 13.7
2 Std N std K 233 65 8.3 0.83 71.1 13.8
3 Liquid K 98 30 9 0.39 68.6 13.9
4 Std N High K 225 50 5.8 0.9 73 12.6
5 Low N, High K 228 62 6.3 0.91 71.2 13
6 Std N, High K 240 52 6.9 0.96 68.9 13.4
7 Std N, High K 245 61 6.8 0.98 69.4 13.6
8 Std N, no K 110 37 9.1 0.44 69.2 13.7
9 Std N, very High K 270 65 6.4 1.08 71.1 13.8

Grain yield t/ha


Hectolitre weight kg/hL


Plant density plants/m2


Protein %


Returns $/ha


Screenings %

Observed trial site soil information
Trial site soil testing
Site Depth Type pH EC P K N A OC CAT
Irwin, WA 0 - 10cm 5.50 0.04 0.65
Irwin, WA 10 - 20cm 5.40 0.02 0.35
Irwin, WA 20 - 30cm 5.50 0.01 0.12
Irwin, WA 30 - 40cm 5.20 0.01
Irwin, WA 40 - 50cm 6.50 0.02
Soil conditions
Trial site Soil texture
Irwin, WA Pale deep sand
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Irwin, WA Tenosol
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



Irwin WA 2017

Observed climate information

Rainfall avg gsr (mm) 213mm

Derived climate information

Irwin WA


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.