Reduce Nitrates and Phosphorus from Subsurface Field Drainage Systems

Nutrient loss through subsurface drainage systems is a major concern throughout the Midwest. This project sought to demonstrate and evaluate the effectiveness of a new conservation practice commonly referred to as a Saturated Buffer (SB). By hydrologically reconnecting a subsurface drainage outlet with an edge-of-field buffer this practice takes advantage of both the denitrification and plant nutrient uptake opportunities that are known to exist in buffers with perennial vegetation as a way to remove nutrients from the drainage water. The USDA-NRCS developed an interim practice standard (739 – Vegetated Subsurface Outlet) in conjunction with this project. Continue reading….