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How does deep ripping affect nitrogen requirements 

2015

Research organisation
Northern Agri Group

Trial details

Researcher(s) Stuart Wakelam
Year(s) 2015
Contributor Northern Agri Group
Trial location(s) 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 Cereal (Grain): Wheat
Treatment type(s)
  • Fertiliser : Rate
  • Fertiliser : Timing
  • Soil Preparation : Tillage
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
Protein (%) Grain yield (t/ha) Nitrogen use efficiency (%) Profit ($/ha)
1 █ Mace █ Not deep ripped █ 0 Flexi-N at sowing █ 0 Flexi-N at Late tillering 11.3 1.08 - -
2 █ Mace █ Not deep ripped █ 0 Flexi-N at sowing █ 0 Flexi-N at Late tillering 12 1.3 37 21
3 █ Mace █ Not deep ripped █ 100 Flexi N at Sowing █ 0 Flexi-N at Late tillering 11.7 1.54 31 46
4 █ Mace █ Not deep ripped █ 0 Flexi-N at sowing █ 50 Flexi-N at late tillering 11.6 1.39 44 40
5 █ Mace █ Not deep ripped █ 0 Flexi-N at sowing █ 100 Flexi-N at late tillering 12.3 1.59 44 56
6 █ Mace █ Not deep ripped █ 0 Flexi-N at sowing █ 100 Flexi-N at late tillering 12.7 1.79 40 71
7 █ Mace █ Deep ripped █ 0 Flexi-N at sowing █ 0 Flexi-N at Late tillering 11.5 2.06 -
8 █ Mace █ Deep ripped █ 0 Flexi-N at sowing █ 0 Flexi-N at Late tillering 11.7 2.32 43 31
9 █ Mace █ Deep ripped █ 100 Flexi N at Sowing █ 0 Flexi-N at Late tillering 11.6 2.5 31 43
10 █ Mace █ Deep ripped █ 0 Flexi-N at sowing █ 50 Flexi-N at late tillering 11.4 2.28 32 16
11 █ Mace █ Deep ripped █ 0 Flexi-N at sowing █ 100 Flexi-N at late tillering 11.6 2.89 57 136
12 █ Mace █ Deep ripped █ 0 Flexi-N at sowing █ 100 Flexi-N at late tillering 11.8 2.99 45 126

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
Binnu, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
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 Binnu WA
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Climate

Binnu WA 2015

Observed climate information

Rainfall trial gsr (mm) 253mm

Derived climate information

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 report and links

2015 trial report



Trial last modified: 25-06-2019 14:29pm AEST