College of Agriculture & Natural Resources

Permanent URI for this communityhttp://hdl.handle.net/1903/1598

The collections in this community comprise faculty research works, as well as graduate theses and dissertations.

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Subject: search.filters.subject.Manure

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Now showing 1 - 3 of 3
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    Fate of antimicrobials and nutrients in dairy manure management systems
    (2018) Schueler, Jenna E; Lansing, Stephanie; Environmental Science and Technology; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    Anaerobic digestion (AD) and composting manure management strategies were explored at the field scale to monitor antimicrobial degradation, nutrient transformations, and optimize mitigation of these pollutants in manure fertilizer to decrease their entry to waterways. Removal of antimicrobials and antimicrobial resistance genes (ARGs) were explored at the bench scale, where AD degraded >85% of antimicrobials. At the field-scale, antimicrobials were not consistently removed, persisting in concentrations up to 34,000 ng/g DW in the AD effluent. The tetM genes were reduced during bench-scale AD suggesting that AD could be an effective treatment for removing tetracycline ARGs from manure. The 100% reduction of sulfadimethoxine antimicrobials during AD did not correspond with Sul1 reduction, illustrating differences in antimicrobial versus gene reductions during manure treatment. Antimicrobials did not degrade significantly during field scale composting, likely due to a shortened composting period (33-days). The field-scale results illuminate limitations of tracking antimicrobials in complex treatment systems.
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    Legal Rulings in Animal Agriculture: An Environmental Law Update
    (2015-08) Ferrell, Shannon
    Presentation used by Shannon Ferrell for his presentation on August 6 covering recent legal developments in animal agriculture.
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    Manure as a Natural Resource: Alternative Management Opportunities
    (University of Maryland Extension, 2014-12) Miller, Jarrod; Moyle, Jon
    Manure, as a source of organic matter and plant nutrients, is an excellent conditioner for soils. As fertilizer in agronomic systems, manure can cycle nutrients between soils, plants and livestock. However, in areas where livestock become concentrated and limited land is available for application, excess nutrients can lead to water quality issues. If manure application is to be locally restricted, alternative uses must be found. These uses can be simple, such as transporting to nutrient poor regions, or require more complex infrastructure, such as energy production or nutrient extraction.