Assessing the yield response to deep ripping over multiple sites across a farm south of Nyabing, Western Australia

2017 - 2018
CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Joel Andrew (Map IQ)
Fiona Hobley (Compass Agriculture)
Year(s) 2017 - 2018
Contributor agVivo
Trial location(s) Nyabing, WA
Assessing the yield response to deep ripping over multiple sites across a farm south of Nyabing, Western Australia locations

To assess the impact of deep ripping on crop yield across varying sites on a farm near Nyabing, WA.

Key messages
  • Subsurface soil compaction has been shown to be a major constraint to crop production and its removal of this compaction via deep ripping can lead to large yield increases.
  • Assessing yield responses on different soil types will guide where future deep ripping work is carried out, with priority given to those soils with the greatest yield increases.
Lead research organisation agVivo
Host research organisation N/A
Trial funding source GRDC AVP00003-A
Related program N/A

The research undertaken as part of this project is made possible by the significant contributions of the Hobley family who setup the demonstration sites. This assessment of the trial and report is funded by the GRDC through the Albany Region Cropping Solution Network.
GRDC Project Number: AVP00003-A

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


Crop type None: No crop specified
Treatment type(s)
  • Management systems: Soil engineering
  • Soil Preparation: Tillage
Trial type
Trial design

Nyabing 2017

Sow date Unknown
Harvest date Unknown
Plot size 36m x 1000m
Plot replication Not specified

Nyabing 2018

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Download the trial report to view additional method/treatment information

Download results

Trial results Table 1: 2017 average Crop Yield for deep rip and adjacent strips.

# Treatment 1
Treatment 2
Grain yield (t/ha)
1 D06 North of Strip 2.151
2 D06 Rip Strip 2.31
3 D06 South of Strip 2.156
4 R09 - South North of Strip 2.35
5 R09 - South Rip Strip 2.65
6 R09 - South South of Strip 2.45
7 R09 - North North of Strip 2.35
8 R09 - North Rip Strip 2.425
9 R09 - North South of Strip 2.41
10 C01 - South North of Strip 2.88
11 C01 - South Rip Strip 3.05
12 C01 - South South of Strip 2.75
13 R07 North of Strip 2.3
14 R07 Rip Strip 2.85
15 R07 South of Strip 2.32
16 C01 - North North of Strip 3.15
17 C01 - North Rip Strip 3.15
18 C01 - North South of Strip 2.8

Grain yield t/ha


Trial results Table 2: Apparent yield benefit to ripping

# Treatment 1
Grain yield (t/ha)
1 D06 0.154
2 C01 North 0.179
3 C01 South 0.218
4 R09North 0.247
5 R09 South 0.044
6 R07 0.556

Grain yield t/ha


Trial results Table 3: 2018 average crop yield for deep rip and control strips

# Treatment 1
Grain yield (t/ha)
1 North Rip 3.59
2 North control 3.37
3 South Control 01 2.15
4 South Rip 2.72
5 South Control 02 2.34

Grain yield t/ha


Trial results Table 4

# Treatment 1
Net 2-year benefit ($/ha) Net 1-year benefit ($/ha) Return on investment compared to control ($/ha) Treatment Cost ($/ha)
1 Control 0 0 0 0
2 Deep Rip North 56 54 69 40
3 Deep Rip South 117 65 143 40

Net 1-year benefit $/ha


Net 2-year benefit $/ha


Return on investment compared to control $/ha


Treatment Cost $/ha

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Nyabing, WA Not specified
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Nyabing, WA Sodosol
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 Nyabing WA
2018 505.2mm
2017 520.9mm
2016 518.8mm
2015 504.3mm
2014 509.4mm
2013 512.6mm
2012 517.8mm
2011 517.3mm
2010 492.6mm
2009 506.7mm
2008 516.8mm
2007 495.8mm
2006 502.7mm
2005 518.5mm
2004 508.1mm
2003 515.4mm
2002 503.2mm
2001 486.0mm
2000 506.6mm
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



Derived climate information

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

Nyabing WA

NOTE: Exact trial site locality unknown - Climate data may not be accurate

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 report and links

Project Final Report

2017 trial report

2017 trial report

Trial last modified: 14-12-2022 15:06pm AEST