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Nitrogen fluxes at ...
Nitrogen fluxes at the root-soil interface show a mismatch of nitrogen fertilizer supply and sugarcane root uptake capacity
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- Brackin, Richard (author)
- Queensland, QLD, 4072, Australia
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- Näsholm, Torgny (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Umeå universitet,Umeå Plant Science Centre (UPSC),Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden,Institutionen för skogens ekologi och skötsel,Institutionen för skoglig genetik och växtfysiologi,Department of Forest Genetics and Plant Physiology
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- Robinson, Nicole (author)
- School of Agriculture and Food Sciences, The University of Queensland, QLD, 4072, Australia
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- Guillou, Stephane (author)
- School of Agriculture and Food Sciences, The University of Queensland, QLD, 4072, Australia
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- Vinall, Kerry (author)
- School of Agriculture and Food Sciences, The University of Queensland, QLD, 4072, Australia
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- Lakshmanan, Prakash (author)
- Sugar Research Australia, 50 Meiers Road, Indooroopilly, QLD 4068, Australia
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- Schmidt, Susanne (author)
- School of Agriculture and Food Sciences, The University of Queensland, QLD, 4072, Australia
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- Inselsbacher, Erich (author)
- Swedish University of Agricultural Sciences,Sveriges lantbruksuniversitet,Institutionen för skogens ekologi och skötsel,Department of Forest Ecology and Management,University of Vienna
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(creator_code:org_t)
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- 2015-10-26
- 2015
- English.
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In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 5
- Related links:
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https://www.nature.c...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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https://res.slu.se/i...
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Abstract
Subject headings
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- Globally only approximate to 50% of applied nitrogen (N) fertilizer is captured by crops, and the remainder can cause pollution via runoff and gaseous emissions. Synchronizing soil N supply and crop demand will address this problem, however current soil analysis methods provide little insight into delivery and acquisition of N forms by roots. We used microdialysis, a novel technique for in situ quantification of soil nutrient fluxes, to measure N fluxes in sugarcane cropping soils receiving different fertilizer regimes, and compare these with N uptake capacities of sugarcane roots. We show that in fertilized sugarcane soils, fluxes of inorganic N exceed the uptake capacities of sugarcane roots by several orders of magnitude. Contrary, fluxes of organic N closely matched roots' uptake capacity. These results indicate root uptake capacity constrains plant acquisition of inorganic N. This mismatch between soil N supply and root N uptake capacity is a likely key driver for low N efficiency in the studied crop system. Our results also suggest that (i) the relative contribution of inorganic N for plant nutrition may be overestimated when relying on soil extracts as indicators for root-available N, and (ii) organic N may contribute more to crop N supply than is currently assumed.
Subject headings
- LANTBRUKSVETENSKAPER -- Lantbruksvetenskap, skogsbruk och fiske -- Skogsvetenskap (hsv//swe)
- AGRICULTURAL SCIENCES -- Agriculture, Forestry and Fisheries -- Forest Science (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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