Document Detail

Microbial mineralization of organic nitrogen forms in poultry litters.
MedLine Citation:
PMID:  21043291     Owner:  NLM     Status:  MEDLINE    
Ammonia volatilization from the mineralization of uric acid and urea has a major impact on the poultry industry and the environment. Dry acids are commonly used to reduce ammonia emissions from poultry houses; however, little is known about how acidification affects the litter biologically. The goal of this laboratory incubation was to compare the microbiological and physiochemical effects of dry acid amendments (Al+Clear, Poultry Litter Treatment, Poultry Guard) on poultry litter to an untreated control litter and to specifically correlate uric acid and urea contents of these litters to the microbes responsible for their mineralization. Although all three acidifiers eventually produced similar effects within the litter, there was at least a 2-wk delay in the microbiological responses using Poultry Litter Treatment. Acidification of the poultry litter resulted in >3 log increases in total fungal concentrations, with both uricolytic (uric acid degrading) and ureolytic (urea degrading) fungi increasing by >2 logs within the first 2 to 4 wk of the incubation. Conversely, total, uricolytic, and ureolytic bacterial populations all significantly declined during this same time period. While uric acid and urea mineralization occurred within the first 2 wk in the untreated control litter, acidification resulted in delayed mineralization events for both uric acid and urea (2 and 4 wk delay, respectively) once fungal cell concentrations exceeded a threshold level. Therefore, fungi, and especially uricolytic fungi, appear to have a vital role in the mineralization of organic N in low-pH, high-N environments, and the activity of these fungi should be considered in best management practices to reduce ammonia volatilization from acidified poultry litter.
Michael J Rothrock; Kimberly L Cook; Jason G Warren; Mark A Eiteman; Karamat Sistani
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of environmental quality     Volume:  39     ISSN:  0047-2425     ISO Abbreviation:  J. Environ. Qual.     Publication Date:    2010 Sep-Oct
Date Detail:
Created Date:  2010-11-03     Completed Date:  2010-11-26     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0330666     Medline TA:  J Environ Qual     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1848-57     Citation Subset:  IM    
USDA-ARS, Animal Waste Management Research Unit, 230 Bennett Ln., Bowling Green, KY 42104, USA.
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MeSH Terms
Base Sequence
DNA Primers
Nitrogen / metabolism*
Polymerase Chain Reaction
Urea / metabolism
Reg. No./Substance:
0/DNA Primers; 0/Manure; 57-13-6/Urea; 7727-37-9/Nitrogen

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