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1 August 2013 Growing season N2O emissions from two-year potato rotations in a humid environment in New Brunswick, Canada
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Abstract

Snowdon, E., Zebarth, B. J., Burton, D. L., Goyer, C. and Rochette, P. 2013. Growing season N2O emissions from two-year potato rotations in a humid environment in New Brunswick, Canada. Can. J. Soil Sci. 93: 279-294. Few studies have examined the effects of crop rotation on N2O emissions. This study quantified N2O emissions from seven 2-yr potato rotations over a 3-yr period, 2008-2010, where the potato phase was present in 2008 and 2010. In addition, the potential to predict variation in cumulative growing season N2O emissions was examined using indices of nitrate availability [nitrate exposure (NE), a time integrated measure of soil nitrate concentrations in the surface soil], carbon availability (cumulative growing season CO2 emissions) and aeration [time-weighted average water-filled pore space (WFPS)]. In the potato phase of the rotations, even for treatments receiving the same fertilizer N rate (193 kg N ha-1), a wide range in cumulative growing season N2O emissions was measured in both 2008 and 2010 (0.39-1.49 and 0.81-2.03 kg N ha-1, respectively). The NE explained 52 and 70% of the variation in growing season N2O emissions under potato production in 2008 and 2010, respectively. Carbon availability also had a significant effect on N2O emissions, as indicated by increased N2O emissions in rotations where residues of the preceding crop resulted in increased CO2 emissions early in the growing season. A large proportion (67%) of the variation in cumulative N2O emissions among rotation crops was also explained by NE. Choice of rotation crop resulted in an almost twofold difference (0.9-1.7 kg N ha-1) in N2O emissions over the 2-yr rotation cycle. Greater N2O emissions over the 2-yr rotation cycle were measured for rotation crops of soybean, Italian ryegrass, red clover and potato than for rotation crops of corn, canola and barley. However, the fertilizer N management in both the potato and rotation crop phases may be as or more important than the choice of rotation crop in influencing the risk of N2O emissions.

Emily Snowdon, Bernie J. Zebarth, David L. Burton, Claudia Goyer, and Philippe Rochette "Growing season N2O emissions from two-year potato rotations in a humid environment in New Brunswick, Canada," Canadian Journal of Soil Science 93(3), 279-294, (1 August 2013). https://doi.org/10.1139/CJSS2012-115
Received: 19 October 2012; Accepted: 1 April 2013; Published: 1 August 2013
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