How does deep ripping affect nitrogen requirements 

2015

Research organisaton

Trial details

Researcher(s) Stuart Wakelam
Year(s) 2015
Contributor Northern Agri Group
Trial location(s) Site 21, Binnu, WA
How does deep ripping affect nitrogen requirements  locations
Aims

To investigate the effects of deep ripping on the need for N fertiliser, and to compare the effectiveness of N applied at seeding compared to late tillering.

Key messages
  • Deep ripping was very worth while at this site but had not effet of lowering crop requirements for N in this situation.
  • Nitrogen requirements may have been lower after deep ripping if there had been more organic N to mineralise (say after a lupin crop) and/or the soil had higher mineralised N levels that were subjected to more leaching pressure.
  • After deep ripping, high N inputs may be more effective delyaed until late tillering. 
Lead research organisation N/A
Host research organisation N/A
Related program N/A
Acknowledgments N/A
Other trial partners Not specified
Download the trial report to view additional trial information

Method

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

Binnu 2015

Sow rate or Target density 60kg/ha Mace
Sow date 13 May 2015
Harvest date 30 October 2015
Plot size Not specified
Plot replication Not specified
Fertiliser

13 May - 80kg.ha Big Phos + 30kg/ha MoP banded below the seed (basal)

30 Jun - Flexi-N

Soil amelioration

Back half of site deep ripped to 30cm immediately after seeding.

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Variety
Treatment 1
Treatment 2
Treatment 3
Grain yield (t/ha) Profit ($/ha) Protein (%) Nitrogen use efficiency (%)
1 Mace Not deep ripped 0 Flexi-N at sowing 0 Flexi-N at Late tillering 1.08 - 11.3 -
2 Mace Not deep ripped 0 Flexi-N at sowing 0 Flexi-N at Late tillering 1.3 21 12 37
3 Mace Not deep ripped 100 Flexi N at Sowing 0 Flexi-N at Late tillering 1.54 46 11.7 31
4 Mace Not deep ripped 0 Flexi-N at sowing 50 Flexi-N at late tillering 1.39 40 11.6 44
5 Mace Not deep ripped 0 Flexi-N at sowing 100 Flexi-N at late tillering 1.59 56 12.3 44
6 Mace Not deep ripped 0 Flexi-N at sowing 100 Flexi-N at late tillering 1.79 71 12.7 40
7 Mace Deep ripped 0 Flexi-N at sowing 0 Flexi-N at Late tillering 2.06 11.5 -
8 Mace Deep ripped 0 Flexi-N at sowing 0 Flexi-N at Late tillering 2.32 31 11.7 43
9 Mace Deep ripped 100 Flexi N at Sowing 0 Flexi-N at Late tillering 2.5 43 11.6 31
10 Mace Deep ripped 0 Flexi-N at sowing 50 Flexi-N at late tillering 2.28 16 11.4 32
11 Mace Deep ripped 0 Flexi-N at sowing 100 Flexi-N at late tillering 2.89 136 11.6 57
12 Mace Deep ripped 0 Flexi-N at sowing 100 Flexi-N at late tillering 2.99 126 11.8 45

Grain yield t/ha


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Nitrogen use efficiency %


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Profit $/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
Site 21, Binnu, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Site 21, Binnu, 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 Site 21, Binnu WA
2015 131.7mm
2014 101.0mm
2013 102.4mm
2012 98.7mm
2011 133.1mm
2010 86.0mm
2009 103.0mm
2008 138.1mm
2007 89.6mm
2006 89.7mm
2005 108.5mm
2004 94.5mm
2003 109.1mm
2002 99.0mm
2001 106.7mm
2000 128.6mm
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

Site 21, Binnu WA 2015


Observed climate information

Rainfall trial gsr (mm) 253mm

Derived climate information

Site 21, Binnu 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 last modified: 25-06-2019 14:29pm AEST