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Nitrous Oxide and Carbon Dioxide Emissions During the Nongrowing Season from Manured Soils under Rainfed and Irrigated Conditions

Hao, X. (2015). Nitrous Oxide and Carbon Dioxide Emissions During the Nongrowing Season from Manured Soils under Rainfed and Irrigated Conditions, 32(7), 648-654. http://dx.doi.org/10.1080/01490451.2014.920940

Abstract

Copyright © 2015 Crown copyright. This study investigated CO<inf>2</inf> and N<inf>2</inf>O emissions from soil receiving long-term cattle feedlot manure applications under rainfed and irrigated conditions in semi-arid southern Alberta, Canada. Soil available N and CO<inf>2</inf> and N<inf>2</inf>O fluxes were measured after fall crop harvesting and prior to next spring's seeding from plots that had received 0 and 60 t ha<sup>−1</sup>yr<sup>−1</sup> cattle feedlot manure application with (Mi0 and Mi60) or without irrigation (Mr0 and Mr60) for 27 years. Both CO<inf>2</inf> and N<inf>2</inf>O fluxes varied considerably over the 7-month nongrowing season. Cumulative CO<inf>2</inf> emissions from manured treatments (Mr60 at 2.20 t ha<sup>−1</sup> and Mi60 at 2.36 t ha<sup>−1</sup>) were 2.6 times values from nonmanured treatments (Mr0 at 0.83 t ha<sup>−1</sup> and Mi0 at 0.92 t ha<sup>−1</sup>). Similarly, cumulative N<inf>2</inf>O emission from manured treatments (Mr60 at 4.54 kg ha<sup>−1</sup> and Mi60 at 5.34 kg ha<sup>−1</sup>) were 8–12 times values from nonmanured treatments (Mr0 at 0.40 kg ha<sup>−1</sup> and Mi0 at 0.70 kg ha<sup>−1</sup>). Growing season irrigation had no effect on CO<inf>2</inf> and N<inf>2</inf>O emission over the nongrowing season.

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