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Nitrogen fluxes at the root-soil interface show a mismatch of nitrogen fertilizer supply and sugarcane root uptake capacity
Queensland, QLD, 4072, Australia.
Umeå University, Faculty of Science and Technology, Umeå Plant Science Centre (UPSC). Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, SE-901 83 Umeå, Sweden.
School of Agriculture and Food Sciences, The University of Queensland, QLD, 4072, Australia.
School of Agriculture and Food Sciences, The University of Queensland, QLD, 4072, Australia.
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2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, 15727Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2015. Vol. 5, 15727
National Category
Forest Science
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URN: urn:nbn:se:umu:diva-111475DOI: 10.1038/srep15727ISI: 000363411400001PubMedID: 26496834OAI: oai:DiVA.org:umu-111475DiVA: diva2:869433
Available from: 2015-11-13 Created: 2015-11-13 Last updated: 2015-11-13Bibliographically approved

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Näsholm, Torgny
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