Wheat response to N and K

2014
CC BY 4.0

Research organisatons
Funding source

Trial details

Researcher(s) Brett Coxon (Summit Fertilizers)
Year(s) 2014
Contributor Facey Group
Trial location(s) Yealering, WA
Wheat response to N and K locations
Aims

Part of a series of trials to assess wheat response to nitrogen and potassium under different conditions across the wheatbelt and, locally, determine rates to improve yield and returns.

Key messages
  • Both N and K have influenced wheat growth at the site, to varying degrees.
  • Summit’s complex soil test interpretation model recommended 90 kg N for a 3 T/ha wheat crop based on the soil sample analyses at this site. With a growing season rainfall of 300 mm and the responses in this trial, an N recommendation of 80 kg/ha appears appropriate.
  • Potassium recommendations from the Summit model were 20 kg K for a 3 T/ha wheat crop. Potassium recommendations will be much more dependent on soil characteristics and laboratory test results, but even on the duplex soil at the site, 10 to 20 kg K/ha looks to be of benefit in helping plants to maximise the potential growth benefits from top-up nitrogen applications.
  • Mace wheat utilises N nutrition for yield, on the whole, but protein does increase somewhat with increasing N application and targeting higher delivery grades is possible if desired.
Lead research organisation Summit Fertilizers
Host research organisation Facey Group
Trial funding source Summit
Related program N/A
Acknowledgments

Living Farm for assistance in establishing and managing the trial. David Stacey for generously providing the trial site.


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

Method

Crop type Cereal (Grain): Wheat
Treatment type(s)
  • Fertiliser: Application Method
  • Fertiliser: Rate
  • Fertiliser: Timing
Trial type Experimental
Trial design Replicated

Yealering 2014

Sow rate or Target density 75 Kk/ha
Sow date 28 May 2014
Harvest date Not specified
Plot size 12m x 2m
Plot replication 3
Fertiliser

100 Kg/ha TSP

Herbicide

Pre emergent: Trifluralin- 2L/ha, Glyphosate- 2L/ha, Sakura- 188g/ha, Logran- 30g/ha. Post-emergent: Velocity- 1L/ha, Ally-3g/ha

Insecticide

Chlorpyrifos - 300mL/ha

Fungicide

Prosaro - 300mL/ha

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

@T1: 2014
# Variety
Treatment 1
Grain yield (t/ha) Protein (%) Fertiliser cost ($/ha) Gross margin ($/ha)
1 Mace Untreated control (0 N + 0 K) 2.58 7.7 $ - 792
1 Mace 0 N + 10 kgK/ha 2.7 7.7 12 817
2 Mace 0 N + 25 kgK/ha 2.77 7.7 31 819
2 Mace 0 N + 50 kgK/ha 2.79 7.7 62 795
3 Mace 40 kgN/ha + 0 K 3.38 8.8 57 981
3 Mace 40 kgN/ha + 10 kgK/ha 3.63 8.9 70 1045
4 Mace 40 kgN/ha +25 kgK/ha 3.45 8.7 88 971
4 Mace 40 kgN/ha + 50 kgK/ha 3.64 9 119 998
5 Mace 80 kgN/ha + 0 K 3.67 10.1 121 1031
5 Mace 80 kgN/ha + 10 kgK/ha 3.82 9.9 134 1039
6 Mace 80 kgN/ha + 25 kgK/ha 3.99 9.8 152 1073
6 Mace 80 kgN/ha + 50 kgK/ha 3.61 10 183 950
7 Mace 120 kgN/ha + 0 K 3.84 11.2 185 1028
7 Mace 120 kgN/ha + 10 kgK/ha 3.92 11.2 198 1041
8 Mace 120 kgN/ha + 25 kgK/ha 3.81 11 216 988
8 Mace 120 kgN/ha + 50 kgK/ha 3.93 11.1 247 995
9 Mace
9 Mace
10 Mace
10 Mace
11 Mace
11 Mace
12 Mace
12 Mace
13 Mace
13 Mace
14 Mace
14 Mace
15 Mace
15 Mace
16 Mace
16 Mace

Grain yield t/ha


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Fertiliser cost $/ha


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Gross margin $/ha


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Protein %


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Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Yealering, WA Sandy duplex
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Yealering, WA Sodosol
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 Yealering WA
2014 450.1mm
2013 465.0mm
2012 461.3mm
2011 402.7mm
2010 414.3mm
2009 441.4mm
2008 442.3mm
2007 417.9mm
2006 485.2mm
2005 463.0mm
2004 428.9mm
2003 444.9mm
2002 410.1mm
2001 407.8mm
2000 475.5mm
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

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Climate

Yealering WA 2014


Observed climate information

Rainfall trial gsr (mm) 250.6mm

Derived climate information

Yealering WA

NOTE: Exact trial site locality unknown - Climate data may not be accurate
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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 report and links

2014 trial report



Trial last modified: 05-06-2019 09:52am AEST