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Effect of Relative Humidity on Ammonia Volatilization from Broiler Litter Kate Cassity

Summary: Effect of Relative Humidity on Ammonia Volatilization from Broiler Litter
Kate Cassity
Advanced Crop and Soil Sciences Seminar
Wednesday, April 13, 2011 at 3:35 pm
Miller Plant Sciences Building, Room 2401
Broiler litter is a great source of plant available N for pastures and crops. However, large
losses of N to the atmosphere through ammonia volatilization can lead to lower crop yields and
environmental contamination. Ammonia volatilization is dependent on many factors: manure
management, soil characteristics, and environmental conditions. Relative humidity (RH) may
play a large role in increased volatilization through the re-humidification of litter and increased
mineralization of uric acid and urea leading to ammonia loss. Understanding the effect of
relative humidity may help to explain high N loss and lead to more precise rate
recommendations. The objectives of this study are to i) determine the effect of RH on litter water
potential ii) determine the effect of litter water potential on decomposition of urea and uric acid
conditions iii) create a model of ammonia volatilization from broiler litter, and iv) validate the
model with laboratory and field studies. The effective of RH on litter water potential will be
evaluated by placing litter samples with two sub-treatments of water content in sealed containers
with relative humidity values ranging from high to low. The water potential of the litter will be
measured at different equilibration times. Urea and uric acid degradation will be measured at
various water potentials. Litter will be adjusted to water potentials ranging from low to high and


Source: Arnold, Jonathan - Nanoscale Science and Engineering Center & Department of Genetics, University of Georgia


Collections: Biotechnology