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Dedicated Bioenergy Crops and Water Erosion
Journal of Environmental Quality
|April 6, 2019
Summary
Perennial warm-season grasses (WSGs) can improve water quality on marginal lands by reducing sediment and nutrient runoff, especially in certain site conditions. Their effectiveness varies, showing significant benefits at one location but not another.
Area of Science:
- Agricultural Science
- Environmental Science
- Soil Science
Background:
- Limited data exists on the water quality impacts of perennial warm-season grasses (WSGs) used as energy crops on marginal lands.
- Understanding these impacts is crucial for sustainable land management and biofuel production.
- Comparison with conventional no-till corn is needed to assess the benefits of WSGs.
Purpose of the Study:
- To evaluate the effects of WSGs on runoff, sediment, and nutrient losses compared to no-till corn.
- To assess the relationship between near-surface soil properties and water quality outcomes.
- To determine the site-specific effectiveness of WSGs in improving water quality on marginal lands.
Main Methods:
- Field experiments were conducted on an eroded soil in Iowa and a pivot corner in Nebraska.
- Treatments included 'Liberty' switchgrass, 'Shawnee' switchgrass, a low-diversity grass mixture, and no-till corn.
- Simulated rainfall events were used to measure water erosion, sediment, and nutrient losses (NO3-N, PO4-P) in 2017.
Main Results:
- No significant differences in runoff or sediment/nutrient losses were observed on the eroded Iowa soil.
- At the Nebraska site, WSGs reduced sediment loss by fivefold compared to corn.
- WSGs at the Nebraska site showed higher wet aggregate stability and residue cover, which correlated negatively with nutrient losses.
Conclusions:
- Perennial warm-season grasses show potential for improving water quality in marginal croplands.
- The benefits of WSGs for reducing sediment and nutrient losses are site-specific.
- Improved soil properties under WSGs contribute to better water quality outcomes.
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