Researcher(s) |
Claire Browne Bill Davoren Vadakattu Gupta John Kirkegaard Stasia Kroker Rick Llewellyn Therese McBeath Alan Richardson Jonathan Sanderman Steve Szarvas |
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Year(s) | 2014 - 2015 |
Contributor | Mallee Sustainable Farming Inc. |
Trial location(s) |
Temora, NSW
Karoonda, SA Horsham, VIC |
To strengthen our knowledge on seasonal changes in the (1) biological value of stubble (2) mineralisation: immobilisation balance (ratio) and (3) the direct supply of N from stubble to crops as influenced by stubble management.
Lead research organisation |
Commonwealth Scientific and Industrial Research Organisation |
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Host research organisation | N/A |
Trial funding source | GRDC MSF00003 |
Trial funding source | CSIRO CSIRO Agriculture |
Related program |
Maintaining profitable farming systems with retained stubble |
Acknowledgments |
Funding for this work was from the Stubble Retention initiative and GRDC projects CSP00186, MSF00003, CSP00138 and CSIRO Agriculture. Thanks to the Loller family (Karoonda) for their generous support in hosting the trials. The contributions from the extended research teams at CSIRO are also gratefully acknowledged. |
Other trial partners | Peer review by Margaret Roper (CSIRO) |
Crop type | Cereal (Grain): Wheat |
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Treatment type(s) |
|
Trial type | Experimental |
Trial design | Replicated |
Sow date | Not specified |
---|---|
Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Fertiliser | Not specified |
Other trial notes |
During the 2014 crop season wheat was fertilized with 15N isotope labelled Urea applied in two doses (i.e. 2 weeks after sowing and at GS 32) @ 70 kg N/ha. Similar experiments were set up at Horsham, Vic and Temora, NSW (@ 100 kg N / ha). Labelling stubble with 15N helps directly trace the transfer of N from wheat stubble into soil organic matter and to the crop in 2015. Following the harvest of 2014 wheat crop, replicated stubble retention treatment plots representing nil (stubble cut low and removed), surface (stubble cut low and retained), standing (stubble cut at standard height and retained) and incorporated (cultivation to 10cm depth following harvest) stubble were established on 2014 wheat crop plots adjacent to the 15N labelled area. A uniform mixture of 15N labelled stubble and chaff samples was prepared using the 15N residue collected after the 2014 crop harvest, e.g. stubble cut to 5-10cm length pieces, and applied in microplots (~2 sq M plots) in the ‘Inc |
Sow date | Not specified |
---|---|
Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Fertiliser | Not specified |
Other trial notes |
During the 2014 crop season wheat was fertilized with 15N isotope labelled Urea applied in two doses (i.e. 2 weeks after sowing and at GS 32) @ 70 kg N/ha. Similar experiments were set up at Horsham, Vic and Temora, NSW (@ 100 kg N / ha). Labelling stubble with 15N helps directly trace the transfer of N from wheat stubble into soil organic matter and to the crop in 2015. Following the harvest of 2014 wheat crop, replicated stubble retention treatment plots representing nil (stubble cut low and removed), surface (stubble cut low and retained), standing (stubble cut at standard height and retained) and incorporated (cultivation to 10cm depth following harvest) stubble were established on 2014 wheat crop plots adjacent to the 15N labelled area. A uniform mixture of 15N labelled stubble and chaff samples was prepared using the 15N residue collected after the 2014 crop harvest, e.g. stubble cut to 5-10cm length pieces, and applied in microplots (~2 sq M plots) in the ‘Inc |
Sow date | Not specified |
---|---|
Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Fertiliser | Not specified |
Other trial notes |
During the 2014 crop season wheat was fertilized with 15N isotope labelled Urea applied in two doses (i.e. 2 weeks after sowing and at GS 32) @ 70 kg N/ha. Similar experiments were set up at Horsham, Vic and Temora, NSW (@ 100 kg N / ha). Labelling stubble with 15N helps directly trace the transfer of N from wheat stubble into soil organic matter and to the crop in 2015. Following the harvest of 2014 wheat crop, replicated stubble retention treatment plots representing nil (stubble cut low and removed), surface (stubble cut low and retained), standing (stubble cut at standard height and retained) and incorporated (cultivation to 10cm depth following harvest) stubble were established on 2014 wheat crop plots adjacent to the 15N labelled area. A uniform mixture of 15N labelled stubble and chaff samples was prepared using the 15N residue collected after the 2014 crop harvest, e.g. stubble cut to 5-10cm length pieces, and applied in microplots (~2 sq M plots) in the ‘Inc |
Sow date | 21 May 2015 |
---|---|
Harvest date | Unknown |
Plot size | Not specified |
Plot replication | Not specified |
Fertiliser |
DAP @ 50 kg/ha and Urea @ 24kg/ha |
Other trial notes |
During the 2014 crop season wheat was fertilized with 15N isotope labelled Urea applied in two doses (i.e. 2 weeks after sowing and at GS 32) @ 70 kg N/ha. Similar experiments were set up at Horsham, Vic and Temora, NSW (@ 100 kg N / ha). Labelling stubble with 15N helps directly trace the transfer of N from wheat stubble into soil organic matter and to the crop in 2015. Following the harvest of 2014 wheat crop, replicated stubble retention treatment plots representing nil (stubble cut low and removed), surface (stubble cut low and retained), standing (stubble cut at standard height and retained) and incorporated (cultivation to 10cm depth following harvest) stubble were established on 2014 wheat crop plots adjacent to the 15N labelled area. A uniform mixture of 15N labelled stubble and chaff samples was prepared using the 15N residue collected after the 2014 crop harvest, e.g. stubble cut to 5-10cm length pieces, and applied in microplots (~2 sq M plots) in the ‘Inc |
Sow date | Not specified |
---|---|
Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Fertiliser | Not specified |
Other trial notes |
During the 2014 crop season wheat was fertilized with 15N isotope labelled Urea applied in two doses (i.e. 2 weeks after sowing and at GS 32) @ 70 kg N/ha. Similar experiments were set up at Horsham, Vic and Temora, NSW (@ 100 kg N / ha). Labelling stubble with 15N helps directly trace the transfer of N from wheat stubble into soil organic matter and to the crop in 2015. Following the harvest of 2014 wheat crop, replicated stubble retention treatment plots representing nil (stubble cut low and removed), surface (stubble cut low and retained), standing (stubble cut at standard height and retained) and incorporated (cultivation to 10cm depth following harvest) stubble were established on 2014 wheat crop plots adjacent to the 15N labelled area. A uniform mixture of 15N labelled stubble and chaff samples was prepared using the 15N residue collected after the 2014 crop harvest, e.g. stubble cut to 5-10cm length pieces, and applied in microplots (~2 sq M plots) in the ‘Inc |
Sow date | Not specified |
---|---|
Harvest date | Not specified |
Plot size | Not specified |
Plot replication | Not specified |
Fertiliser | Not specified |
Other trial notes |
During the 2014 crop season wheat was fertilized with 15N isotope labelled Urea applied in two doses (i.e. 2 weeks after sowing and at GS 32) @ 70 kg N/ha. Similar experiments were set up at Horsham, Vic and Temora, NSW (@ 100 kg N / ha). Labelling stubble with 15N helps directly trace the transfer of N from wheat stubble into soil organic matter and to the crop in 2015. Following the harvest of 2014 wheat crop, replicated stubble retention treatment plots representing nil (stubble cut low and removed), surface (stubble cut low and retained), standing (stubble cut at standard height and retained) and incorporated (cultivation to 10cm depth following harvest) stubble were established on 2014 wheat crop plots adjacent to the 15N labelled area. A uniform mixture of 15N labelled stubble and chaff samples was prepared using the 15N residue collected after the 2014 crop harvest, e.g. stubble cut to 5-10cm length pieces, and applied in microplots (~2 sq M plots) in the ‘Inc |
# |
Treatment 1
|
Stubble yield (t/ha) | Harvest index (value) | Grain yield (t/ha) | Nitrogen uptake (kg N/ha) |
---|---|---|---|---|---|
1 | █ Karoonda | 3.31 | 0.41 | 2.51 | 66 |
2 | █ Horsham | 4.7 | 0.32 | 2.19 | 97 |
3 | █ Temora | 8.38 | 0.28 | 3.29 | 742 |
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.