from field to stream: measuring sediment and nutrient losses - kuehner
TRANSCRIPT
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From Field to Stream: Measuring Sediment and Nutrient Losses to Demonstrate the Need for Sub-Watershed Scale Conservation Planning
Kevin KuehnerSoil Scientist , CCA
SWCS Conference, Greensboro, North Carolina, July 27, 2015
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Minnesota Challenge
• Tourism / outdoor recreation a lead industry• Agricultural products top export • Over 2,400 impairments requiring TMDLs
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On-Farm Demonstrations
• Discovery Farms• Root River Field to
Stream Partnership
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Field to Stream Partnership
• What’s the water quality like today? What are the long-term trends?
• What’s the range of sediment and
nutrient losses?
• How effective are new and existing BMPs? Targeted BMPs? What’s feasible?
• What's the best approach to engage producers and deliver cost-effective conservation?
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Field to Stream Partnership
• Started in 2009 • Small scale, nested
monitoring design, 9 stations
• Minimum 10-year year effort
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Study Phases
Implement Practices
Baseline Monitoring
& Assessments
Focus on Surface Runoff first and then practices for Nitrate-N
Phase 12010-2015
Phase II 2016-2020
Planning and Field Walkovers
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Root River Watershed
75 Miles
35 milesGlacial Till
Karst Bluffland Karst
Headwaters
Crystal Creek
Bridge Creek
CornSoybeanForest, Pasture, Grass, Alfalfa, Other
Source: 2010 cropland data layer, NASS
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Headwaters2,778 acres
94% cropland
Crystal Creek3,728 acres
78% cropland
Bridge Creek4,665 acres
64% cropland
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Corn/soybean, no manure Corn silage, liquid dairy manure
Corn, soybean and alfalfa, liquid hog manure
Continuous corn grain or silage, liquid dairy or hog manure
Field #3= 96 acres Field #4= 21 acres
Field #2 = 18 acresField #1 = 26 acres
Tile
Edge of Field
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Year-round sampling in the
harshest conditions
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Root River Field to Stream: Average Annual Losses (2010-2014)
Average Losses
Avg. 46% frozen
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Four months of the year accounted for more than 90% of the annual losses: March, April, May and June
4 sites, 5 year average, 2010-2014
Timing of Field Surface Losses
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Existing practices inventory
Documented active erosion areas
Ag Conservation Planning Framework (ACPF)
Runoff Risk (Adjusted for Cropland in Grass Cover)
Conservation Planning Tools
ACPF tools developed by M. Tomer, S. Porter, D. James, USDA-ARS
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14
Existing practices inventory
Documented active erosion areas
Ag Conservation Planning Framework (ACPF)
Stream Power Index (SPI)
Conservation Planning Tools
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Stream Power Index, Statistical Analysis and Field Validation
Odds of erosion occurring at non-BMP sites are about 6.5 times higher than for BMP sites.
T. Dogweiler et al, Winona State Univ.
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• The odds of erosion occurring are almost 8 times higher at Bridge Creek than at either Crystal Creek or the Headwaters Watershed.
• Sediment and Phosphorus concentrations are nearly 3X higher in Bridge Creek.
Stream Power Index and Water Quality
Sediment Total Phosphorus
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Delivery Process
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Producers sent their own letter to encourage their neighbors to participate
Field Walkovers to Initiate the Conversation
Field Walkovers
Walkover Status
100% of crop acres in Crystal and over 70% in Bridge Creek.
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Preliminary Results
• Total of $1.1 million in conservation needs identified.
– About 1/3 of these costs were classified as a high priority.
Simple Report + Dedicated Planner
Field Walkovers
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• Total of $700,000 dollars in structural and vegetative practice needs and fixes.
Field Walkovers
Next…seek funding for those that want it. Study goal is to have all high priority sites addressed in the next 2 years.
…..process builds the foundation with farmers and their advisors to then tackle nitrate-N loss strategies
-40% of this cost was associated with fixes to existing practices; a low hanging fruit.
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From Field to Stream: Measuring Sediment and Nutrient Losses to Demonstrate the Need for Sub-Watershed Scale Conservation Planning
Special Thanks to Project Farmers,Partners, SWCDs/NRCS and MDA Monitoring Unit.
Kevin KuehnerSoil Scientist, CCA
SWCS Conference, Greensboro, North Carolina, July 27, 2015
THANK YOU!