Effect of time of sowing and variety on grain yield: MAC demonstration


Research organisaton

Trial details

Researcher(s) Jake Hull (SARDI)
Year(s) 2016
Contributor SARDI Minnipa Agricultural Centre
Trial location(s) Site 5, Minnipa Agricultural Centre, SA
Effect of time of sowing and variety on grain yield: MAC demonstration locations

To compare grain yield and grain quality of a mid-late maturing variety (Trojan) and two early-mid season maturing varieties (Mace and Scepter).

Key messages
  • There was no difference in grain yield (t/ha) between the early season variety (Trojan) and the later varieties (Mace and Scepter) sown 13 days later.
  • In 2016 sowing Mace and Scepter earlier on 13 May reduced grain protein by 0.3% compared to sowing it thirteen days later.
  • For the later sowing on 26 May, Mace and Scepter had similar grain yield, however, protein was higher for Scepter.
  • When sown early, Trojan had higher protein than Mace and Scepter.
Lead research organisation SARDI Minnipa Agricultural Centre
Host research organisation N/A
Related program N/A

Amanda Cook, Ian Richter and Brian Dzoma, SARDI Minnipa Agricultural Centre.

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


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

Minnipa Agricultural Centre 2016

Sow rate or Target density 70 kg/ha
Sowing machinery

On 13 May Trojan was sown using a 30 ft (9 m) air seeder along the full length of the paddock using three repetitions at 70 kg/ha seeding rate with 60 kg/ha DAP (18:20:0:0). Mace and Scepter were also sown at 70 kg/ha seeding rate with 60 kg/ha DAP (18:20:0:0) on this date for comparison between these two varieties.


The late time of sowing was on 26 May with Mace and Scepter, using the same rates of seed and fertilizer as the Trojan. These varieties were sown on strips left between the early sowing, so no extra chemicals were used. As Trojan is a longer growing season wheat variety, it was not included in the later time of sowing.


The paddock strips were harvested using a plot header with four 8.6 m strips per variety with three repetitions done across the demonstration area. Only averages can be compared between varieties with different times of sowing

Sow date 13 May 2016 late time of sowing was on 26 May with Mace and Scepter
Harvest date Not specified
Plot size 8.6m x 1.6m
Plot replication 3

60 kg/ha DAP (18:20:0:0)


Knockdown chemicals used were 1.5 L/ha of glyphosate, 500 ml/ha ester 680 and 118 g/ha Sakura + SOA and Li 700. Sakura was used to help control grass weeds as there was little germination of weeds at sowing.

Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Site 5, Minnipa Agricultural Centre, SA Red loam
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 5, Minnipa Agricultural Centre, 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



Site 5, Minnipa Agricultural Centre SA 2016

Observed climate information

Rainfall avg ann (mm) 325mm
Rainfall avg gsr (mm) 241mm
Rainfall trial total (mm) 391mm
Rainfall trial gsr (mm) 268mm

Derived climate information

Site 5, Minnipa Agricultural Centre 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.

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Trial last modified: 10-09-2019 15:17pm AEST