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'Emissions of Carbon Dioxide, Methane and Ammonia from Fresh Dairy and Beef Manure'
Enzhu Hu (huenzhu@gmail.com), Utah State University; Pakorn Sutitarnnontr (pakorn@aggiemail.usu.edu), Utah State University; Markus Tuller (mtuller@cals.arizona.edu), University of Arizona; Scott Jones (scott.jones@usu.edu), Utah State University



Gaseous emissions from animal manure are controversial sources for greenhouse gas emissions and air pollution. There are an estimated 376,000 livestock operations in the United States. Over 9 million US dairy cows generate about 249 million tons of wet manure annually. We monitored emissions of carbon dioxide (CO2), methane (CH4), and ammonia (NH3) from fresh dairy manure for two weeks at a time in a research greenhouse at Utah State University. The fresh dairy/beef manure was procured from the Caine Dairy Teaching and Research Center feedlot (Wellsville, UT, USA). A closed-dynamic chamber (LI-8100-101, LI-COR Biosciences, USA) coupled with a portable Fourier Transformed Infrared (FTIR) spectroscope (Gasmet DX-4030, Gasmet Technology Oy, Helsinki, Finland) was employed for continuous measurements of gas concentrations and fluxes in addition to temperature. Six sets of data from fresh dairy manure and one set from fresh beef manure were obtained. Emission potentials (EP) and cumulative emissions (CE) for each gas from different data sets were compared. The annual emissions of CO2, CH4, and NH3 from fresh manure for a single animal were estimated.