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Researcher(s) |
David Armstrong Naveed Aslam Yunying Fang Shane Hildebrand Yan Jia Albert Oates Wayne Pitt Ehsan Tavakkoli Shihab Uddin Qing Wei |
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Year(s) | 2020 |
Contributor | Department of Primary Industries NSW |
Trial location(s) |
Rand, NSW, NSW
|
Further information | View external link |
This current experiment investigated the potential of using farm grown crop residues as ameliorants for alkaline dispersive subsoils in the medium rainfall region of southern NSW.
• Crop residue deep placement in combination with chemical fertilisers and a low rate of gypsum demonstrated consistent yield improvement (27%; averaged for four successive years) in alkaline dispersive subsoil.
• Organic and inorganic amendment deep placement increased root growth, and soil water use from the deeper clay layers during the critical reproductive stages of crop development.
• Improvements in grain yield with organic and inorganic amendment deep placement were associated with a reduction in subsoil pH, exchangeable sodium percentage (ESP%) and increased microbial activity, which promoted soil aggregation.
Randomised complete block design (RCBD) with four replications
Lead research organisation | N/A |
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Host research organisation | N/A |
Trial funding source | GRDC DAV00149 |
Trial funding source | DPI NSW |
Related program | N/A |
Acknowledgments |
This experiment was part of the ‘Understanding the amelioration processes of the subsoil application of amendments in the Southern Region’ project, DAV00149, 2015–20. The project is a collaborative partnership between GRDC, Agriculture Victoria, NSW DPI, La Trobe University, University of South Australia, Southern Farming Systems, Primary Industries and Regions South Australia, South Australian Research and Development Institute and University of Tasmania. |
Other trial partners | Not specified |
Crop type | Cereal (Grain): Wheat |
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Treatment type(s) |
|
Trial type | Experimental |
Trial design | Randomised,Replicated,Blocked |
Sowing machinery |
Wheat (Triticum aestivum cv. ScepterA) was sown with an air seeder with rows spaced at 250 mm using a GPS auto-steer system |
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Sow date | 16 May 2020 |
Harvest date | 7 December 2020 |
Plot size | Not specified |
Plot replication | 4 |
Plot randomisation | yes |
Fertiliser |
• 78 kg/ha di-ammonium phosphate (DAP) (at sowing) • Urea 150 kg/ha (top dressed on 22 May 2020) |
Other trial notes |
This research paper is an extract from the publication Southern NSW Research Results 2021, available at |
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.