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Ecosystem C and N dynamics affected by a modified spring barley trait with increased nitrogen use - a simulation case study
Department of Crop Production Ecology, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
University of Gävle, Faculty of Education and Business Studies, Department of Business and Economic Studies, Economics. Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
Department of Soil and Environment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
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2017 (English)In: Acta Agriculturae Scandinavica - Section B, ISSN 0906-4710, E-ISSN 1651-1913Article in journal (Refereed) Epub ahead of print
Abstract [en]

To what extent might a crop with increased plant N uptake efficiency and/or N demand increase plant biomass and soil carbon storage, decrease N leaching, and reduce the need for N fertilisation? This was assessed for a fertilised sandy loam site in central Sweden cultivated with spring barley for a four year period using a process based crop and soil simulation model (SOILN) calibrated to fit observations of field experiments with non-modified crops. Crop properties were changed in accordance with previous model applications to other crops with higher N uptake and utilisation efficiencies, to resemble potential effects of breeding. For the modified crops a doubling of daily uptake efficiency of soil mineral N and/or increase of radiation use efficiency by 30%, increased plant biomass by 3%?30%, decreased N leaching by 1%?30% and increased soil organic carbon (SOC) content by 1?12?g?C?m?2 year?1. The larger changes were mainly due to increased uptake efficiency. Fertilisation of the modified spring barley crop could be reduced while still producing the same plant biomass as the non-modified crop. The plant biomass to N leaching ratio of the modified crops increased. The simulated changes in plant biomass and SOC were sensitive to weather conditions suggesting that in situ experiments would need to cover a large range of weather conditions to evaluate the performance of new crop traits under climatic variability. The study suggests a strong need that field experiments are accompanied with model applications, when exploring the potential of the modified crops under variable conditions.

Place, publisher, year, edition, pages
Taylor & Francis , 2017.
Keyword [en]
Plant breeding; N uptake; N utilisation; N leaching; SOC; sandy loam; Sweden
National Category
Economics Ecology
Identifiers
URN: urn:nbn:se:hig:diva-25408DOI: 10.1080/09064710.2017.1385835Scopus ID: 2-s2.0-85030850140OAI: oai:DiVA.org:hig-25408DiVA: diva2:1149583
Available from: 2017-10-16 Created: 2017-10-16 Last updated: 2017-10-24Bibliographically approved

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CiteExportLink to record
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