Stubble Components Demonstration


Research organisatons
Funding source

Trial details

Researcher(s) Damian Jones
Year(s) 2017
Contributor Irrigated Cropping Council
Trial location(s) Kerang, VIC
Stubble Components Demonstration locations

The demonstrate the effects of increasing N fertiliser rates on harvest index and stubble N%.

Key messages

Increased rates of N resulted in increased biomass, but the relationship between stubble N content and applied N was poor.

Higher applied  N resulted in higher Harvest Index

Harvest Index ranged from 0.45 to 0.47. 

Lead research organisation Birchip Cropping Group
Host research organisation Irrigated Cropping Council
Trial funding source GRDC BDW00024
Related program Maintaining profitable farming systems with retained stubble
Acknowledgments N/A
Other trial partners Not specified
Download the trial report to view additional trial information


Crop type Wheat
Treatment type(s)
  • Fertiliser: Rate
  • Stubble: Type
Trial type Demonstration
Trial design Unreplicated

Kerang 2017

Sow rate or Target density 175 plants/m2
Sowing machinery

John Shearer tynes

9 inch row spacing

Knife points

Press wheels

Sow date 4 May 2017
Harvest date 15 December 2017 Mid December
Plot size 15m x 3m
Plot replication 1

125 kg DAP/ha starter

100 or 200 kg urea/ha Aug 2

0, 100, 200 or 300 kg urea/ha Aug 20


1.5 l/ha Glyphosate 540 May 3

75 ml/ha Goal May 3

118 g/ha Sakura IBS May 4

750 ml/ha Triathlon July 20 

Seed treatment Raxil
Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Variety
Treatment 1
Treatment 2
Harvest index (value) Grain protein (%) Grain yield (t/ha) Stubble N (Kg N/ha)
1 Scout 100 kg urea/ha 100 kg urea/ha 0.45 9.4 7.45 6.8
2 Scout 100 kg urea/ha 200 kg urea/ha 0.463 10.7 6.95 6.9
3 Scout 100 kg urea/ha 0.446 9.3 7.54 5.4
4 Scout 100 kg urea/ha 300 kg urea/ha 0.476 11.1 6.57 7.7
5 Scout 200 kg urea/ha 0.461 9.9 7.45 5.7
6 Scout 200 kg urea/ha 100 kg urea/ha 0.456 9.5 6.51 4.7
7 Scout 200 kg urea/ha 200 kg urea/ha 0.475 10.6 7.67 6

Grain yield t/ha


Grain protein %


Harvest index value


Stubble N Kg N/ha

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Kerang, VIC Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Kerang, VIC Vertosol
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 Kerang VIC
2017 585.6mm
2016 580.3mm
2015 540.8mm
2014 579.3mm
2013 586.9mm
2012 588.1mm
2011 602.5mm
2010 613.7mm
2009 533.8mm
2008 477.7mm
2007 431.2mm
2006 424.8mm
2005 428.4mm
2004 381.2mm
2003 367.1mm
2002 347.9mm
2001 424.8mm
2000 430.4mm
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



Kerang VIC 2017

Observed climate information

Rainfall avg ann (mm) 375mm
Rainfall avg gsr (mm) 232mm
Rainfall trial total (mm) 425mm
Rainfall trial gsr (mm) 220mm

Derived climate information

Kerang VIC


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.

Trial last modified: 06-12-2021 09:27am AEST