Abstract
Episodic nitrous oxide (N2O) emissions from Vertisols used for furrow-irrigated cotton production mainly occur in response to early season irrigation events. This study evaluated the impact of N fertiliser placement and timing strategies on N2O emissions from Vertisols under cotton production in northeast Australia. We compared N2O emissions in two experiments during the 2015–16 summer. Each experiment consisted of two site-years of data from different commercial cotton paddocks. Experimental comparisons were: (1) all N fertiliser applied pre-plant vs split-N application and (2) applying pre-plant N fertiliser into the irrigated vs non-irrigated side of the plant bed. Where all N fertiliser was applied pre-plant, 46–96% of total N2O emissions occurred in response to the first irrigation. Where N application was split, 33–34% of total N2O emissions followed the in-crop N applications, 2–7 times more than from the same irrigations where no in-crop N was applied (all pre-plant). Splitting N application between pre-sowing and in-season applications gave no difference in cumulative N2O at one site but increased total N2O loss at the other (99 vs 63 g N2O–N/ha). Changing the placement of the pre-sowing N fertiliser band from the non-irrigated to the irrigated side of the hill changed the source location of N2O emissions but the not the cumulative N2O loss. Varying the timing and placement of pre-plant N application affected the spatial and temporal intensity of soil N2O emissions, but generally not the overall total loss of N2O.
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Acknowledgements
These experiments were part of the project ‘Determining optimum nitrogen strategies for abatement of emissions for different irrigated cotton systems’, AOTG14013 2013–17 funded by the Australian Department of Agriculture and Water Resources, administered by the Cotton Research and Development Corporation and supported by New South Wales Department of Primary industries (NSW DPI). Thanks to Ross Burnett, Ray Fox and Rod Smith for providing the experimental sites and applying the nitrogen fertiliser treatments. Thanks to Amanda Noone, Brooke Cutler, Pete Perfrement, Tim Grant and Wayne McPherson for field assistance. All soil and plant N analyses were carried out by Clarence Mercer in the ISO9001-accredited laboratory at Tamworth Agricultural Institute, NSW DPI.
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Schwenke, G.D., McPherson, A. Banded urea placement did not affect nitrous oxide emission from furrow-irrigated Vertisols. Nutr Cycl Agroecosyst 122, 1–12 (2022). https://doi.org/10.1007/s10705-021-10177-y
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DOI: https://doi.org/10.1007/s10705-021-10177-y