Drainage Water Quality Impacts of Various In-field Nutrient Management Practices: Comparison of Biofuel Systems Site
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The Comparison of Biofuel Systems (COBS) site has 24 0.4-acre research plots equipped with a drainage water monitoring system installed in 2008 (Figures 1 and 2). Plots have <1 percent slope with Nicollet and Webster soils. Tile lines are installed at a depth of 3.5 feet spaced 45 feet apart. Management practices are evaluated for their impact on nitrate-N and dissolved phosphorus (P) loss and crop yield. To quantify the impact of these practices, researchers are monitoring subsurface drainage volume and collecting flow-proportional water samples for nitrate-N and dissolved P analysis (Figure 3). The 30-year average annual rainfall at COBS is 35.8 inches. The average tile drainage flow from 2010-2016 is 9.0 inches.
Helmers, Matt, "Drainage Water Quality Impacts of Various In-field Nutrient Management Practices: Comparison of Biofuel Systems Site" (2017). Extension and Outreach Publications. 572.
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