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Swensson Källén, Annika, 2023. Underlying mechanisms behind nitrous oxide emissions in oilseed radish, Raphanus sativus var. oleiformis, and Phacelia tanacetifolia. Second cycle, A2E. Alnarp: SLU, Dept. of Plant Breeding (from 130101)



Greenhouse gases are a driving force of climate change and the annual greenhouse gas emissions were higher between 2010-2019 than any other time in human history (Skea et. al. 2022). Cover crops are used to mitigate the effect of climate change, but recent studies indicate that the use of the cover crop oilseed radish results in significantly larger emissions of nitrous oxide (N2O) compared to other cover crops (Dörsch et. al. 2022; Müller Júnior et. al. 2019; Olofsson and Ernfors 2022; Thomas et. al. 2017). Results from Olofsson and Ernfors (2022) study showed that Raphanus sativus var oleiformis (OR) causes significantly higher emission of N2O compared to Phacelia tanacetifolia
(PH) even though the quality and quantity were similar. The hypothesis in this study was that the glucosinolates in OR provides a carbon source for denitrifying bacteria, thus causing a significantly higher N2O emission compared to PH. The hypothesis was tested in a laboratory setting during 32
days of gas measurement with plant material of OR and PH incubated with and without added glucose. Surprisingly, aboveground plant material of PH showed highest emissions throughout the study. The result of this study could not confirm the hypothesis since added glucose did not affect
the N2O emission. In further studies, it is recommended to increase the number of replicates and optimize the methodology to be able to draw any conclusions.

Main title:Underlying mechanisms behind nitrous oxide emissions in oilseed radish, Raphanus sativus var. oleiformis, and Phacelia tanacetifolia
Authors:Swensson Källén, Annika
Supervisor:Ernfors, Maria and Börjesson, Desirée
Examiner:Prade, Thomas
Volume/Sequential designation:UNSPECIFIED
Year of Publication:2023
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:LM008 Horticultural Science Master's Programme, 120.0hp
Supervising department:(LTJ, LTV) > Dept. of Plant Breeding (from 130101)
Keywords:nitrous oxide, glucosinolates, greenhouse gases, oilseed radish, Phacelia tanacetifolia, cover crops, labile C
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Deposited On:02 Nov 2023 10:56
Metadata Last Modified:03 Nov 2023 02:01

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