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This 1998 fact sheet discusses different pit additives and their effectiveness. Pit additives have been used for years to reduce odor emissions from livestock operations.
Iowa Odor Control Demonstration Project
Iowa State University Extension and Outreach
Farm Management, Building and Structures, Agricultural and Biosystems Engineering
Agricultural Education | Bioresource and Agricultural Engineering
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Burns, Robert T., "Iowa Odor Control Demonstration Project: Pit Additives" (1998). Agriculture and Environment Extension Publications. 143.