Wheat grain yield and protein in response to sowing date, nitrogen and variety


Research organisatons
Funding source

Trial details

Researcher(s) Marianne Hoogmoed, Victor Sadras, Rob Wheeler (SARDI), Sarah Noack, Peter Hooper (Hart), Barry Mudge (Barry Mudge Consulting)
Year(s) 2016
Contributor Hart Field Site Group
Trial location(s) Site 5, Hart, SA
Wheat grain yield and protein in response to sowing date, nitrogen and variety locations

To unravell the combined effects of variety, sowing time and N, on yield and its components.

Key messages
  • Grain yield responded to the interaction between season, variety, N rate and sowing date.
  • The dry finish to the 2015 season meant sowing later reduced yield. Nitrogen application did not affect yield regardless of sowing time.
  • The end of 2016 was characterised by a wet and cool finish and yield increased with N, but there was no sowing time effect.
  • Nitrogen application generally increased protein. Only in 2015 did late sowing increase protein further.
Lead research organisation South Australian Research and Development Institute
Host research organisation Hart Field Site Group
Trial funding source GRDC DAS00147
Related program N/A

The authors thank GRDC for project funding (project DAS00147) and the Hart and SARDI crew for managing the trial.

Other trial partners Hart Field Site Group and Barry Mudge Consulting
Download the trial report to view additional trial information


Crop type Wheat
Treatment type(s)
  • Variety
  • Variety: Type
Trial type Experimental
Trial design Randomised,Replicated,Blocked

Hart 2016

Sow rate or Target density 210 plants/m2 Axe, Cobra, Mace, Scout, Spitfire and Trojan
Sow date 30 April 2016
Harvest date Not specified
Plot size 1.75m x 10m
Plot replication Not specified
  • 0 kg N/ha
  • 60 kg N/ha split between seeding and beginning of tillering (GS20)
Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Variety
Grain yield (t/ha) Protein (%)
1 Axe 2.2 11.1
2 Axe 3.3 11.5
3 Axe 2.9 11
4 Axe 3.6 10.7
5 Cobra 2.6 9.4
6 Cobra 5 10.5
7 Cobra 2.8 9.2
8 Cobra 4.8 9.6
9 Mace 2.4 9.5
10 Mace 3.9 11.4
11 Mace 2.9 9.5
12 Mace 4.4 9.4
13 Scout 2.8 8.9
14 Scout 5.2 10.2
15 Scout 3.1 8.8
16 Scout 4.8 9.4
17 Spitfire 1.8 10.7
18 Spitfire 3.7 11.7
19 Spitfire 2.3 10.5
20 Spitfire 3.7 10.5
21 Trojan 3.3 8.8
22 Trojan 4.5 10.3
23 Trojan 2.9 9.3
24 Trojan 5.1 10

Grain yield t/ha


Protein %

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 5, Hart, SA Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 5, Hart, SA Chromosol
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, Hart 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: 11-06-2019 15:04pm AEST