Merriwagga CWFS trial results: 1999-2006


Research organisaton

Trial details

Researcher(s) Barry Haskins (NSW DPI) and Lawrence Higgings (CWFS)
Year(s) 2006
Contributor Central West Farming Systems
Trial location(s) Merriwagga, NSW
Merriwagga CWFS trial results: 1999-2006 locations

To investigate the sustainability and profitability of cropping rotations and tillage methods on Merriwagga soils.

Key messages
  • Proper rotations (irrespective of tillage methods) incorporating no more than two cereal crops in sequence with the addition of either a break crop or a fallow once in every three years is ideal. This rotation allows a very productive and sustainable farming system in our environment.
  • The most profitable system since 1999 has been two years of cereal followed by a break crop such as peas under no till.
  • No till systems are now becoming more profitable in the trial than cultivated systems under every rotation.
  • No till will work on our problem soils so long as effective weed control is achieved.
  • Under a continuous cereal rotation, the impact of weeds, diseases, poor nutrition and subsequently lower yields has lowered profitability
Lead research organisation Central West Farming Systems
Host research organisation N/A
Related program N/A

A huge thank you to the Barber family, the dedicated committee, and the local site sponsors who donate time, money and products that allow this trial to progress into what we have today.

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


Crop type Multiple
Trial type Experimental
Trial design Blocked

Merriwagga 2006

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

# Treatment 1
Treatment 2
Grain yield (kg/ha) Gross margin ($/ha) Income ($/ha)
1 Wheat after peas Conventional tillage 352 -90.65 98.7
2 Wheat after peas No till 677 48.77 189.69
3 Wheat after fallow Conventional tillage 1315 178.91 368.26
4 Wheat after fallow No till 1260 213.23 352.91
5 What after wheat Conventional tillage 395 -121.4 110.6
6 What after wheat No till 367 -85.95 102.76
7 Peas after barley Conventional tillage 200 -153.47 56
8 Peas after barley No till 400 -80.96 112
9 Fallow after wheat Conventional tillage - -121.06 0
10 Fallow after wheat No till - -22.56 0

Grain yield kg/ha


Gross margin $/ha


Income $/ha

Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Merriwagga, NSW Not specified
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Merriwagga, NSW Kandosol
National soil grid Source
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.

Merriwagga NSW


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

2006 trial report

Individual Trial Project data and information and OFT metadata are licensed under a Creative Commons Attribution 4.0 International License.
The data and information accessed through OFT may also be subject to Terms of Use specified by the Trial Contributor,
in which case the Terms of Use of a Trial Contributor take precedence over other information provided on OFT.
Trial last modified: 02-05-2018 11:45am AEST