scholarly journals Application Rate and Timing Effects on Urease Inhibitor Performance for Minimizing Ammonia Emissions From Beef Cattle Feedyards

2004 ◽  
Author(s):  
David B. Parker ◽  
Syam Pandrangi ◽  
L. Wayne Greene ◽  
Lal K. Almas ◽  
N. Andy Cole ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Application Rate ◽  
Urease Inhibitor ◽  
Ammonia Emissions ◽  
Timing Effects

Effect of Urease Inhibitor Application Rate and Rainfall on Ammonia Emissions from Beef Manure

2011 ◽  
Vol 55 (1) ◽  
pp. 211-218 ◽  
Author(s):  
D. B. Parker ◽  
M. B. Rhoades ◽  
N. A. Cole ◽  
V. P. Sambana
Keyword(s):  
Application Rate ◽  
Urease Inhibitor ◽  
Ammonia Emissions

RATE AND FREQUENCY OF UREASE INHIBITOR APPLICATION FOR MINIMIZING AMMONIA EMISSIONS FROM BEEF CATTLE FEEDYARDS

2005 ◽  
Vol 48 (2) ◽  
pp. 787-793 ◽  
Author(s):  
D. B. Parker ◽  
S. Pandrangi ◽  
L. W. Greene ◽  
L. K. Almas ◽  
N. A. Cole ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Urease Inhibitor ◽  
Ammonia Emissions

SURFACE AMENDMENTS TO MINIMIZE AMMONIA EMISSIONS FROM BEEF CATTLE FEEDLOTS

2001 ◽  
Vol 44 (3) ◽  
Author(s):  
Y. Shi ◽  
D. B. Parker ◽  
N. A. Cole ◽  
B. W. Auvermann ◽  
J. E. Mehlhorn
Keyword(s):  
Beef Cattle ◽  
Ammonia Emissions ◽  
Surface Amendments ◽  
Cattle Feedlots

scholarly journals Fate of applied urea 15N in a soil-maize system as affected by urease inhibitor and nitrification inhibitor

2010 ◽  
Vol 56 (No. 1) ◽  
pp. 8-15 ◽  
Author(s):  
L. Zhang ◽  
Z. Wu ◽  
Y. Jiang ◽  
L. Chen ◽  
Y. Song ◽  
...  
Keyword(s):  
Nitrification Inhibitor ◽  
Maize Yield ◽  
Application Rate ◽  
Environmental Benefits ◽  
N Recovery ◽  
Urease Inhibitor ◽  
N Application ◽  
Maize Production ◽  
Normal Maize ◽  
Soil Recovery

A micro-plot field experiment with reduced urea <sup>15</sup>N application was conducted to study the effects of urease inhibitor NBPT (N-(<i>n</i>-butyl) thiophosphoric triamide) and nitrification inhibitor DMPP(3,4-dimethyl-1H-pyrazolium dihydrogen) on the fate of applied urea <sup>15</sup>N; it aimed to find an efficient way to reduce the urea N application rate while improving the agronomic and environmental benefits. Five treatments were installed, i.e., 180 kg N/ha (N<sub>1</sub>, conventional application rate), 126 kg N/ha (N<sub>2</sub>, reduced to 70% conventional application rate), N<sub>2</sub> + NBPT, N<sub>2</sub> + DMPP, and N<sub>2</sub> + NBPT + DMPP. Compared with treatment N<sub>1</sub>, all the other treatments had a significantly higher total <sup>15</sup>N recovery by both soil and plant (<i>P</i> < 0.05 48.20, 41.39, 37.69, 38.85 and 34.83% soil recovery for N<sub>2</sub> + NBPT + DMPP, N<sub>2</sub> + DMPP, N<sub>2</sub> + NBPT, N<sub>2</sub> and N<sub>1</sub>treatment, respectively; and 42.68, 40.86, 40.25, 37.18 and 36.30% plant recovery for N<sub>2</sub> + NBPT + DMPP, N<sub>2</sub> + DMPP, N<sub>2</sub> + NBPT, N<sub>2</sub>, and N<sub>1</sub> treatment, respectively). In the plant <sup>15</sup>N recovery, the <sup>15</sup>N absorbed in grain/stem was highest in treatment N<sub>2</sub> + NBPT + DMPP. The maize biomass and the maize yield had a slight increase in treatment N<sub>2</sub> + NBPT + DMPP, compared with those in treatment N<sub>1</sub>. In sum, for the maize production in study area, N<sub>2</sub> + NBPT + DMPP application method would be a feasible way to ensure the normal maize yield while improving yield quality, saving urea fertilizer, and protecting the environment.

Flux-Gradient Estimates of Ammonia Emissions from Beef Cattle Feedyard Pens

2007 ◽  
Author(s):  
Richard W Todd ◽  
N Andy Cole ◽  
Lowry A Harper ◽  
Thomas K Flesch
Keyword(s):  
Beef Cattle ◽  
Gradient Estimates ◽  
Ammonia Emissions ◽  
Flux Gradient

Effect of Dietary Crude Protein on Ammonia Emissions From Open-Lot Beef Cattle Feedyards

2003 ◽  
Author(s):  
Syamalakumar Pandrangi ◽  
David B. Parker ◽  
L. Wayne Greene ◽  
Lal K. Almas ◽  
Marty B. Rhoades ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Crude Protein ◽  
Ammonia Emissions ◽  
Dietary Crude Protein

scholarly journals Modelling the impacts of ammonia emissions reductions on North American air quality

2009 ◽  
Vol 9 (18) ◽  
pp. 7183-7212 ◽  
Author(s):  
P. A. Makar ◽  
M. D. Moran ◽  
Q. Zheng ◽  
S. Cousineau ◽  
M. Sassi ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Air Quality ◽  
Beef Cattle ◽  
North American ◽  
Ammonia Emissions ◽  
Emissions Reductions ◽  
Emission Reductions ◽  
Current Form ◽  
Emissions Inventory ◽  
Regional Air Quality

Abstract. A unified regional air-quality modelling system (AURAMS) was used to investigate the effects of reductions in ammonia emissions on regional air quality, with a focus on particulate-matter formation. Three simulations of one-year duration were performed for a North American domain: (1) a base-case simulation using 2002 Canadian and US national emissions inventories augmented by a more detailed Canadian emissions inventory for agricultural ammonia; (2) a 30% North-American-wide reduction in agricultural ammonia emissions; and (3) a 50% reduction in Canadian beef-cattle ammonia emissions. The simulations show that a 30% continent-wide reduction in agricultural ammonia emissions lead to reductions in median hourly PM2.5 mass of <1 μg m−3 on an annual basis. The atmospheric response to these emission reductions displays marked seasonal variations, and on even shorter time scales, the impacts of the emissions reductions are highly episodic: 95th-percentile hourly PM2.5 mass decreases can be up to a factor of six larger than the median values. A key finding of the modelling work is the linkage between gas and aqueous chemistry and transport; reductions in ammonia emissions affect gaseous ammonia concentrations close to the emissions site, but substantial impacts on particulate matter and atmospheric deposition often occur at considerable distances downwind, with particle nitrate being the main vector of ammonia/um transport. Ammonia emissions reductions therefore have trans-boundary consequences downwind. Calculations of critical-load exceedances for sensitive ecosystems in Canada suggest that ammonia emission reductions will have a minimal impact on current ecosystem acidification within Canada, but may have a substantial impact on future ecosystem acidification. The 50% Canadian beef-cattle ammonia emissions reduction scenario was used to examine model sensitivity to uncertainties in the new Canadian agricultural ammonia emissions inventory, and the simulation results suggest that further work is needed to improve the emissions inventory for this particular sector. It should be noted that the model in its current form neglects coarse mode base cation chemistry, so the predicted effects of ammonia emissions reductions shown here should be considered upper limits.

Use of Fat and Zeolite to Reduce Ammonia Emissions from Beef Cattle Feedyards

2007 ◽  
Author(s):  
N Andy Cole ◽  
Richard W Todd ◽  
David B Parker
Keyword(s):  
Beef Cattle ◽  
Ammonia Emissions
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