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https://hdl.handle.net/2440/94944
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DC Field | Value | Language |
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dc.contributor.author | Noack, S. | - |
dc.contributor.author | McLaughlin, M. | - |
dc.contributor.author | Smernik, R. | - |
dc.contributor.author | McBeath, T. | - |
dc.contributor.author | Armstrong, R. | - |
dc.contributor.editor | Yunusa, I. | - |
dc.date.issued | 2012 | - |
dc.identifier.citation | Proceedings of 16th Australian Agronomy Conference 2012, 2012 / Yunusa, I. (ed./s), pp.1-6 | - |
dc.identifier.uri | http://hdl.handle.net/2440/94944 | - |
dc.description.abstract | Phosphorus (P) within stubble can be released directly to soil as soluble P or assimilated by microorganisms and subsequently released back into the soil through mineralisation. The chemical composition of P in crop stubble may play an important role in the rate of stubble P release. Crop stubble sampled after grain maturity in 2010/11 and 2011/12 contained 1-5 kg P/ha. Nuclear magnetic resonance (NMR) spectroscopy was used to determine the different forms of P present in the stubble. On average 50% of the total stubble P was orthophosphate which is water soluble and readily available to plants and microorganisms. The remaining P forms were identified as phospholipids, ribonucleic acid (RNA) and pyrophosphate. The majority (65-90%) of P in the major stubble component (stems) was water-soluble, and most of this was detected as orthophosphate. However, this includes organic P forms that may have been hydrolysed during the water extraction. Results from a field leaching experiment show between 0 and 7.5% of stubble P was released from 52 mm (collected after 11 mm and 41.4 mm) of summer rainfall. That indicated crop stubbles in the field release some P into soil solution which could be readily accessed by plant roots. However, the slower release of stubble P in the field compared to the laboratory suggests that residues potentially play a more important role as a long term P supply to subsequent crops. Subsequent experimentation will measure the contribution of surface applied and incorporated stubble P to crop plant P nutrition using 33P isotopic techniques. | - |
dc.description.statementofresponsibility | Sarah Noack, Mike McLaughlin, Ronald Smernik, Therese McBeath, and Roger Armstrong | - |
dc.language.iso | en | - |
dc.publisher | Regional Institute Online Publishing | - |
dc.rights | Copyright status unknown | - |
dc.source.uri | http://www.regional.org.au/au/asa/2012/nutrition/8326_noacksr.htm | - |
dc.subject | Crop residues | - |
dc.subject | speciation | - |
dc.subject | nutrient cycling | - |
dc.title | The form and fate of stubble phosphorus in cropping soils | - |
dc.type | Conference paper | - |
dc.contributor.conference | 16th Agronomy Conference 2012: Capturing Opportunities and Overcoming Obstacles in Australian Agronomy (14 Oct 2012 - 18 Oct 2012 : Armidale, NSW) | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | McLaughlin, M. [0000-0001-6796-4144] | - |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 3 |
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