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- Title
Isotope Ratio Mass Spectrometry Monitoring of Nitrogen Volatilization from Beef Cattle Feces and <sup>15</sup>N-Labeled Synthetic Urine.
- Authors
Ayadi, Ferouz Y.; Cortus, Erin L.; Clay, David E.; Hansen, Stephanie A.
- Abstract
A 15-day bench-scale manure storage experiment with a slurry mixture comprising beef cattle feces and synthetic urine with 15N-labeled urea was conducted to evaluate the source of volatilized ammonia nitrogen (NH3-N). Beef cattle feces was mixed daily in a 1:2.2 mass ratio with 15N-labeled urine and added for four consecutive days to 2-L storage containers and then left undisturbed for eleven days. Isotope ratio mass spectrometry was used to determine the origin of aerial NH3-N losses from the relative isotopic abundance of N in the 15N-labeled slurry mixture. On average 84% of total NH3-N losses originated from the urine portion and were highest during the first two to four days, when fresh material was added. After fresh material addition ceased, daily NH3-N emission from the urine decreased gradually, whereas emission from the feces remained relatively constant. Calculations showed that over 34% of aerial N was not captured, suggesting that other N gas emission is significant from slurry mixtures. Likely all uncaptured N losses were from urinary urea. The study verified the applicability of 15N-labeled synthetic urine for beef slurry mixtures. However, the results suggest further research to explain and model the NH3 and N release from fecal material is warranted and to determine the identity of the uncaptured N losses.
- Subjects
ISOTOPIC fractionation; NITROGEN isotopes; MASS spectrometry; NITROGEN content of manures; SLURRY
- Publication
Atmosphere, 2015, Vol 6, Issue 5, p641
- ISSN
2073-4433
- Publication type
Article
- DOI
10.3390/atmos6050641