2008 Annual Report 1a.Objectives (from AD-416) Evaluate the effect of alternative manure management practices on emissions from swine facilities and manure storage systems 1b.Approach (from AD-416) These objectives will be achieved through a combination of experimental and theoretical approaches to develop a framework that can be applied across the United States. The initial studies will be conducted in central Iowa using corn-soybean as a standard crop and then comparing this system with a range of management scenarios, e.g., nutrient management or tillage. This will provide a baseline for the range of expected responses to management systems. These comparisons will be made to determine the range of expected responses in terms of greenhouse gas emissions through year-around monitoring over each phase of the rotation. These techniques are developed for CO2, N2O, CH4, and NH3. All of these gases are of regulation (NH3). There is little information to guide these processes under different management scenarios including manure management. 3.Progress Report This project is designed to evaluate the effect of alternative manure management practices on emissions from swine facilities and manure storage systems. Observations have been collected throughout a production cycle of grow-finish swine to evaluate the effect of zeolite on the emission of ammonia, hydrogen sulfide, methane, and nitrous oxide. Initial observations show there was little effect of the addition of zeolite and any minor differences were eliminated when the building became a naturally ventilated building in late spring. Observations are being planned for a comparison of aerated tanks to simulate alternative methods of handling manure compared to anaerobic manure storage. (NP206, Component 1)