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This 1998 publication discusses biocovers. They are fibrous biological materials such as straw or chopped cornstalks that are placed on top of liquid storage units to provide a physical aerobic barrier between the liquid manure surface and the air. Read about their effectiveness.
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: Biocovers" (1998). Agriculture and Environment Extension Publications. 149.