Presentation
Application Rate and Timing Effects on Urease Inhibitor Performance for Minimizing Ammonia Emissions From Beef Cattle Feedyards
2004 ASAE/CSAE Annual International Meeting
(2004)
Abstract
A laboratory study was conducted to evaluate how rate and timing of urease inhibitor application affects ammonia emissions from simulated beef cattle feedyard surfaces. The urease inhibitor N-(n-butyl)thiophosphoric triamide (NBPT) was applied at rates of 0, 1 and 2 kg/ha, at 8, 16, and 32 day frequencies, and with or without simulated rainfall. Synthetic urine was added every 2 days to the manure surface. Gaseous NH3 was trapped in a sulfuric acid solution using a vacuum system and analyzed for nitrogen using automated procedures. NBPT applied every 8 days was most effective, with the 1 and 2 kg/ha NBPT treatments resulted in 49 and 66% reduction in NH3 emission rates, respectively. The 8-day, 1 kg/ha NBPT treatment had the most promising cost/benefit ratio of 0.48. Simulated rainfall reduced the NH3 emission rates slightly as compared to the non-rainfall treatments, though the differences were not statistically different.
Keywords
- Ammonia,
- air quality,
- odor,
- nitrogen,
- urea,
- manure,
- beef cattle,
- feedlot,
- urease
Disciplines
Publication Date
August, 2004
Location
Ottawa, ON, Canada
Citation Information
David B. Parker, Syam Pandrangi, L. Wayne Greene, Lal K. Almas, et al.. "Application Rate and Timing Effects on Urease Inhibitor Performance for Minimizing Ammonia Emissions From Beef Cattle Feedyards" 2004 ASAE/CSAE Annual International Meeting (2004) Available at: http://works.bepress.com/jacek_koziel/76/