Conserving soil moisture, does stubble or a fallow help on a red loam?

2012

Research organisaton
Funding source

Trial details

Researcher(s) Yvette Oliver (CSIRO) and Nadine Hollamby (Liebe Group)
Year(s) 2012
Contributor Liebe Group
Trial location(s) Site 3, East Wubin, WA
Conserving soil moisture, does stubble or a fallow help on a red loam? locations
Aims

To determine if various farm management techniques improve the storage of out-of-season rainfall and whether this leads to improvements in crop growth and/or yield.

Key messages
  • Overall imposing a fallow allowed for a small amount of extra water to be stored in the soil and a small amount of extra nitrogen. As a result there was a small yield gain of 0.2 t/ha in 2012. 
  • In this trial the fallow treatment was planted then sprayed out in August to replicate what is known as an ‘opportunistic’ fallow compared to a ‘strategic’ fallow where no crop is planted for 18 months. 18 month fallows would have different results to the ones reported here.
  • Other benefits of fallow that were not recorded in this trial but could have contributed to the yield gain are improved weed control, disease breaks and opportunity for early sowing. 
Lead research organisation N/A
Host research organisation N/A
Trial funding source GRDC LIE00006
Related program N/A
Acknowledgments

GRDC for funding the trial and Keith Carter & Co for hosting the trial.


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

Method

Crop type Barley
Treatment type(s)
  • Stubble: Management
Trial type Demonstration
Trial design Unreplicated

East Wubin 2012

Sow rate or Target density 44
Sow date 5 May 2012
Harvest date Not specified
Plot size 15m x 300m
Plot replication Not specified
Paddock history 2009 field peas, 2010 wheat, 2011 wheat
Fertiliser

5/5/12: 70 kg/ha Agstar Extra, 65 L/ha Flexi-N banded

Herbicide

15/2/12: 1.2 L/ha Roundup, 0.5 L/ha Ester 800, 0.2 L/ha Garlon, 0.03 L/ha Atrazine

7/5/12: 1.8 L/ha Trifluralin, 150 g/ha Metribuzin, 0.5 L/ha Sprayseed

3/7/12: 0.6 L/ha Intervix

Download the trial report to view additional method/treatment information

Download results

Trial results Table 1

# Treatment 1
Nearest neighbour control (%) Protein (%) Grain yield (t/ha) Hectolitre weight (kg/hL)
1 Continous crop with standing stubble 100 12.7 2 63
2 Continous crop with standing stubble 100 12.8 1.9 65
3 Fallow 109 12.6 2.1 67
4 Flattened stubble 104 13 2 65
5 Old fallow 105 13.5 2.1 65

Grain yield t/ha


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Hectolitre weight kg/hL


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Nearest neighbour control %


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Protein %


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Observed trial site soil information
Trial site soil testing
Site Depth Type pH EC P K N A OC CAT
Site 3, East Wubin, WA 0 - 10cm Red loamy duplex 4.80
Site 3, East Wubin, WA 10 - 30cm Red loamy duplex
Soil conditions
Trial site Soil texture
Site 3, East Wubin, WA Red loamy duplex
Derived trial site soil information
Australian Soil Classification Source
Trial site Soil order
Site 3, East Wubin, WA 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

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Climate

Site 3, East Wubin WA 2012


Observed climate information

Rainfall trial gsr (mm) 126mm

Derived climate information

Site 3, East Wubin WA

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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.




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