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United States Department of Agriculture

Agricultural Research Service

Title: Application Rate and Timing Effects on Urease Inhibitor Performance for Minimizing Ammonia Emissions from Beef Cattle Feedyards

Authors
item Parker, D. - WTAMU
item Pandrangi, S. - WTAMU
item Greene, L. - TAES
item Almas, L. - WTAMU
item Rhoades, M. - WTAMU
item Cole, Noel
item Koziel, J. - TAES

Submitted to: American Society of Agricultural Engineers Meetings Papers
Publication Type: Abstract Only
Publication Acceptance Date: May 3, 2004
Publication Date: August 1, 2004
Citation: Parker, D.B., Pandrangi, S., Greene, L.W., Almas, L.K., Rhoades, M.B., Cole, N.A., Koziel, J. 2004. Application rate and timing effects on urease inhibitor performance for minimizing ammonia emissions from beef cattle feedyards. American Society for Agricultural Engineers. Paper No. 044080.

Technical 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 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. Ammonia was trapped in a sulfuric acid solution using a vacuum system and analyzed for nitrogen using automated procedures. NBPT applied every 8 days and at 1 and 2 kg/ha resulted in 51.6 and 67.5 percent reduction in ammonia emission rates, respectively. Only the NBPT applied every 8 days was effective in reducing ammonia emissions, indicating that NBPT should be applied every 8 days or less. The 8-day, 1 kg/ha NBPT treatment had the most promising cost-benefit ratio of 1.26. Simulated rainfall had little effect on the performance of NBPT, indicating that moisture content has little effect on NBPT performance.

Last Modified: 4/19/2014
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