Date post: | 14-Jan-2017 |
Category: |
Environment |
Upload: | national-institute-of-food-and-agriculture |
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College of Agriculture and Life SciencesDenitrification within Saturated Riparian Buffers Re-designed
to Remove Nitrate from Artificial Subsurface Drainage
Thomas IsenhartIowa State University
Dan Jaynes and Tim ParkinUSDA – National Laboratory for Agriculture and Environment
Kirsten HofmockelDOE – Pacific Northwest National Laboratory
USDA-AFRI Foundational Program
College of Agriculture and Life Sciences
Tile Nitrate Concentrations in Perspective
• Iowa Drinking Water Standard• 10 mg L-1 Nitrate-N
• Aquatic Life Criteria• 2.18 mg L-1 Nitrate-N
• Hypoxia in the Gulf of Mexico• 45% Total N Load Reduction
Alternatives for Tile-drained Landscapes?
Nutrient-Removal Wetland
Bioreactor
USDA-NRCS
IDALS - DSC
IA Soybean Association
Question
Could reconnecting tile flow to riparian buffers remove substantial amounts of nitrate before it reaches surface waters?
USDA-NRCS
Soil Greenhouse Gas Emissions
2015 Nitrous Oxide Emissions
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Kg N
2O-N
ha-1
yr-1
0
1
2
3
4
5
Bear CreekSouth Skunk
Saturated Buffers
Conventional Buffers