Ammonia emissions from urine patches amended with N stabilized fertilizer formulations
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In rotational grazing systems, it is common practice to apply nitrogen (N) fertiliser within 24 h of grazing thus resulting in addition of N fertiliser to urine patches. However, there is a lack of information on what the potential is, if any, to use this common practice to deliver N stabilisers to urine patches via N fertiliser formulations to reduce N losses to the environment. The objective of this study was to investigate the effect of applying urea fertiliser (with and without N stabilisers) 24 h after urine patch deposition on NH3 emissions. Treatments included (1) urine, (2) urea, (3) urine + urea, (4) urine + urea with N-(butyl)thiophosphoric triamide (NBPT), (5) urine + urea with dicyandiamide (DCD) and (6) urine + urea with both NBPT and DCD. Treatments were applied on two occasions, May and June, under contrasting soil moisture and meteorological conditions to a temperate grassland site. Urine (569–883 kg N ha−1) was applied 24 h prior to urea fertiliser application (40 kg N ha−1). There was no significant reduction or increase in NH3 emission factors from treatments receiving the two N stabilisers (NBPT and DCD) in the May and June application timings compared to the other treatments. The results of this study suggest that common farm practice of applying N fertiliser the day after grazing in rotational grazing systems offers no reduction in NH3 emission rates from urine patches where the N stabiliser inclusion rate is designed to reduce the fertiliser-based N losses only.
KeywordsUrea Urine NBPT DCD Ammonia volatilisation Grassland
The authors thank Ms Francesca Reville and internship students for assistance with field sampling. The study was funded by the Irish Department of Agriculture, Food and the Marine (Project No.: 13 S 430).
- Chambers B, Dampney P (2009) Nitrogen efficiency and ammonia emissions from urea-based and ammonium nitrate fertilisers. In: Proceedings No. 657 2009, vol 657. International Fertiliser Society, York, UKGoogle Scholar
- European Commission (2001) Directive 2001/81/EC of the European Parliament and the Council of 23 October 2001 on national emission ceilings for certain atmospheric pollutants. L309/220.127.116.111Google Scholar
- Krol D, Minet EP, Forrestal P, Lanigan GJ, Mathieu O, Richards KG. The interactive effects of various nitrogen fertiliser formulations applied to urine patches on nitrous oxide emissions in grassland Irish. J Agric Food Res (Under review)Google Scholar
- Ledgard SF, Menneer JC, Dexter MM, Kear MJ, Lindsey S, Peters JS, Pacheco D (2008) A novel concept to reduce nitrogen losses from grazed pastures by administering soil nitrogen process inhibitors to ruminant animals: a study with sheep Agriculture. Ecosyst Environ 125:148–158. doi: 10.1016/j.agee.2007.12.006 CrossRefGoogle Scholar
- Sanz-Cobena A, Misselbrook TH, Arce A, Mingot JI, Diez JA, Vallejo A (2008) An inhibitor of urease activity effectively reduces ammonia emissions from soil treated with urea under Mediterranean conditions Agriculture. Ecosyst Environ 126:243–249. doi: 10.1016/j.agee.2008.02.001 CrossRefGoogle Scholar
- Schulte RPO, Diamond J, Finkele K, Holden NM, Brereton AJ (2005) Predicting the soil moisture conditions of Irish grasslands. Irish J Agric Food Res 44:95–110Google Scholar
- Watson CJ, Miller H, Poland P, Kilpatrick DJ, Allen MDB, Garrett MK, Christianson CB (1994) Soil properties and the ability of the urease inhibitor N-(n-BUTYL) thiophosphoric triamide (nBTPT) to reduce ammonia volatilization from surface-applied urea. Soil Biol Biochem 26:1165–1171. doi: 10.1016/0038-0717(94)90139-2 CrossRefGoogle Scholar
- Zaman M, Blennerhassett JD (2010) Effects of the different rates of urease and nitrification inhibitors on gaseous emissions of ammonia and nitrous oxide, nitrate leaching and pasture production from urine patches in an intensive grazed pasture system Agriculture. Ecosyst Environ 136:236–246. doi: 10.1016/j.agee.2009.07.010 CrossRefGoogle Scholar
- Zaman M, Zaman S, Nguyen M, Smith T, Nawaz S (2013) The effect of urease and nitrification inhibitors on ammonia and nitrous oxide emissions from simulated urine patches in pastoral system: a two-year study Science of the total. Environment 465:97–106Google Scholar