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- W2772476324 abstract "Abstract Oilseed rape ( OSR , Brassica napus L.) is an important feedstock for biodiesel; hence, carbon dioxide ( CO 2 ), methane ( CH 4 ) and particularly fertilizer‐derived nitrous oxide (N 2 O) emissions during cultivation must be quantified to assess putative greenhouse gas ( GHG ) savings, thus creating an urgent and increasing need for such data. Substrates of nitrification [ammonium ( NH 4 )] and denitrification [nitrate ( NO 3 )], the predominant N 2 O production pathways, were supplied separately and in combination to OSR in a UK field trial aiming to: (i) produce an accurate GHG budget of fertilizer application; (ii) characterize short‐ to medium‐term variation in GHG fluxes; (iii) establish the processes driving N 2 O emission. Three treatments were applied twice, 1 week apart: ammonium nitrate fertilizer ( NH 4 NO 3 , 69 kg‐N ha −1 ) mimicking the farm management, ammonium chloride ( NH 4 Cl, 34.4 kg‐N ha −1 ) and sodium nitrate (Na NO 3 , 34.6 kg‐N ha −1 ). We deployed SkyLine2D for the very first time, a novel automated chamber system to measure CO 2, CH 4 and N 2 O fluxes at unprecedented high temporal and spatial resolution from OSR . During 3 weeks following the fertilizer application, CH 4 fluxes were negligible, but all treatments were a net sink for CO 2 (ca. 100 g CO 2 m −2 ). Cumulative N 2 O emissions (ca. 120 g CO 2 ‐eq m −2 ) from NH 4 NO 3 were significantly greater ( P < 0.04) than from Na NO 3 (ca. 80 g CO 2 ‐eq m −2 ), but did not differ from NH 4 Cl (ca. 100 g CO 2 ‐eq m −2 ) and reduced the carbon sink of photosynthesis so that OSR was a net GHG source in the fertilizer treatment. Diurnal variation in N 2 O emissions, peaking in the afternoon, was more strongly associated with photosynthetically active radiation ( PAR ) than temperature. This suggests that the supply of carbon (C) from photosynthate may have been the key driver of the observed diurnal pattern in N 2 O emission and thus should be considered in future process‐based models of GHG emissions." @default.
- W2772476324 created "2017-12-22" @default.
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- W2772476324 date "2017-12-19" @default.
- W2772476324 modified "2023-10-12" @default.
- W2772476324 title "Greenhouse gas emissions from the energy crop oilseed rape (<i>Brassica napus</i> ); the role of photosynthetically active radiation in diurnal N<sub>2</sub> O flux variation" @default.
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- W2772476324 doi "https://doi.org/10.1111/gcbb.12491" @default.
- W2772476324 hasPublicationYear "2017" @default.
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