Nitrate-N load reduction measured in a central Iowa restored oxbow

This short communication presents new data collected from a tile-fed oxbow site in north-central Iowa and reports on the quantification of NO3-N load reductions using a mass balance approach. Using improved monitoring equipment deployed at the site in 2017, including a continuously-reading nitrate sensor, a NO3-N budget for the oxbow was developed to estimate annual and monthly load reductions occurring in the reconstructed oxbow. Daily NO3-N input was primarily from two drainage tiles and concentrations in the oxbow ranged from