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Instrumentation for Evaluating Differences in Ammonia Volatilization from Broiler Litter and Cake¹

D. M. Miles^*,2, P. R. Owens, P. A. Moore, Jr. and D. E. Rowe

^* USDA-Agricultural Research Service, Genetics and Precision Agriculture Research Unit, 810 Hwy 12 East, Mississippi State 39762; Purdue University, Department of Agronomy, Lilly Hall of Life Sciences, 915 W. State St., West Lafayette, IN 47907-2054; USDA-Agricultural Research Service, Center of Excellence for Poultry Science, Plant Sciences 115, University of Arkansas, Fayetteville 72701; and Mississippi State University, Experimental Statistics, Dorman Hall Room 149, Mississippi State 39762

Correspondence: ² Corresponding author: dana.miles{at}ars.usda.gov

Greater understanding of the mechanisms affecting NH₃ volatilization from reused broiler bedding is needed to determine pathways for mitigating NH₃ emissions. A chamber acid trap (CAT) system was developed to provide an improved laboratory method for determining NH₃ volatilization from litter or cake samples and for assessing treatment technologies to decrease NH₃ losses from poultry litter. The CAT system offers precision control of air flow rate through sample chambers as well as straightforward, precise determination of the amount of N volatilized. This article outlines the basic setup of the CAT system. The system can be utilized and modified for researching specific mechanisms involving physical, chemical, or biological treatments affecting NH₃ volatilization from litter or cake.

Key Words: ammonia • broiler • cake • litter • method

¹ Mention of trade names or commercial products in this article is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the USDA.