Flex-N x Stubble


Research organisaton
Funding source

Trial details

Researcher(s) James Easton (CSBP)
Ryan Guthrie (CSBP)
Rowan Maddern (CSBP)
Year(s) 2012
Contributor North East Farming Futures
Trial location(s) Chapman Valley, Yuna, WA
Flex-N x Stubble locations

To compare the effectiveness of Flexi-N through the boom before seeding, banded at seeding and applied at early tillering - where wheat stubble was either burnt or retained.

Key messages

This site had high soil nitrate reserves (45 mg/kg Nit N in 0 - 10cm) but there were still very good responses to Flexi-N. Although there were no Flexi-N placement/timing or stubble effects on yield, an analysis of protein yield showed that stubble reduced N recovery in the grain by about 30 kg protein/ha or 5 kg N/ha – most likely due to increased immobilisation. Leaf disease symptoms were most severe where stubble was retained but they were less obvious where Flexi-N was banded. Hectolitre weights were 78 – 79 kg/hl and screenings were 2 - 3% in all treatments.

Lead research organisation North East Farming Futures
Host research organisation N/A
Trial funding source Chemical Suppliers Australia (CSBP)
Related program N/A
  • Stuart Smart, Chapman Valley
  • James Easton, Ryan Guthrie and Rowan Maddern, CSBP Field Research
  • Planfarm
  • AHRI
  • CSBP
  • Nufarm
  • GRDC
  • Landmark

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


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

Chapman Valley, Yuna 2012

Sow rate or Target density 74kg/ha
Sow date 14 May 2012
Harvest date Not specified
Plot size Not specified
Plot replication 3

Basal 100 kg/ha Big Phos; Flexi-N (0, 80 and 2 * 80L/ha)

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Protein (%) Protein Yield (kg/ha) Grain yield (t/ha)
1 Burnt 10.6 377 3.48
2 Burnt 80FN (Boom) 10.1 382 3.81
3 Burnt 80FN (Banded) 9.6 353 3.66
4 Burnt 80FN at Z13/14 9.6 393 3.98
5 Burnt 80FN (Banded) and 80FN at Z13/14 10.9 440 4.04
6 Unburnt 9.6 297 3.21
7 Unburnt 80FN (Boom) 10.2 363 3.59
8 Unburnt 80FN (Banded) 9.5 350 3.7
9 Unburnt 80FN at Z13/14 9.5 350 3.74
10 Unburnt 80FN (Banded) and 80FN at Z13/14 10.2 407 4.04

Grain yield t/ha


Protein %


Protein Yield kg/ha

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Chapman Valley, Yuna, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Chapman Valley, Yuna, WA Tenosol
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 Chapman Valley, Yuna WA
2012 113.2mm
2011 186.7mm
2010 115.9mm
2009 121.7mm
2008 177.0mm
2007 135.1mm
2006 144.1mm
2005 126.9mm
2004 132.9mm
2003 141.0mm
2002 127.3mm
2001 117.5mm
2000 170.8mm
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



Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Chapman Valley, Yuna WA


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: 25-06-2019 12:54pm AEST