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Livestock manure driving stream nitrate
Christopher S Jones1, Chad W Drake2, Claire E Hruby3
1University of Iowa, 332 Trowbridge Hall, Iowa City, IA, 52242, USA. christopher-s-jones@uiowa.edu.
Ambio
|December 21, 2018
Summary
Livestock concentration significantly increases stream nitrate levels in Iowa watersheds. Better manure nitrogen management is crucial for improving water quality and reducing fertilizer uncertainty.
Area of Science:
- Environmental Science
- Agricultural Science
- Water Quality
Background:
- Livestock industry growth has led to fewer farms with more animals.
- The impact of this consolidation on landscape-scale stream water quality remains understudied.
Purpose of the Study:
- Quantify the effects of livestock concentration on stream nitrate levels.
- Compare two western Iowa watersheds with high livestock density to seven others.
Main Methods:
- Utilized high-frequency data on nitrate concentration and stream discharge.
- Analyzed commercial nitrogen fertilizer use and manure-generated nitrogen inputs for each watershed.
Main Results:
- Watersheds with the highest livestock concentration exhibited significantly higher stream nitrate levels.
- Commercial fertilizer inputs showed little difference, likely due to manure nitrogen availability.
Conclusions:
- Livestock concentration is a major driver of elevated stream nitrate.
- Improved nitrogen (N) management, including soil and manure analysis, is essential for water quality improvement.
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