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The fate of urine nitrogen with use of a nitrification inhibitor

Selbie, Diana
Cameron, Keith C.
Di, Hong J.
Moir, James L.
Lanigan, G. J.
Laughlin, R. J.
Richards, K. G.
Date
2012
Type
Conference Contribution - published
Fields of Research
ANZSRC::0703 Crop and Pasture Production , ANZSRC::0503 Soil Sciences
Abstract
Pasture-grazed ruminants in Ireland contribute a significant proportion of nitrogen (N) loss to the environment through excreta deposition. Feed N utilisation by the ruminant animal is low with 60-90% of ingested N returned to the soil/pasture system in the excreta, particularly in the urine (Haynes and Williams, 1993). The urine N loading rate in a single cattle urine patch is approximately 1000 kg N ha⁻¹ (Haynes and Williams, 1993). N balance studies have estimated the fate of urine N on a range of soils (Clough et al., 1998). Application of dicyandiamide (DCD) nitrification inhibitor has consistently reduced N leaching and N2O emissions from urine patches (Di and Cameron,2007; de Klein et al., 2011), but produced variable pasture N responses (Di and Cameron, 2007; Zaman and Blennerhassett, 2010). A ¹⁵N balance study was conducted on grassland lysimeters in Ireland to investigate the fate of urine N with and without the application of DCD nitrification inhibitor.
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