Click on “Download PDF” for the PDF version or on the title for the HTML version.

If you are not an ASABE member or if your employer has not arranged for access to the full-text, Click here for options.

Abstract. Subsurface Bioreactors are used to reduce nutrient transport from agricultural fields, mainly in the Midwestern United States. They are cost effective, have long lives, and can be operated to have no effect on drainage effectiveness. At present in Illinois, an empirical model, which relies on performance curves, is used to estimate bioreactor efficiency and nutrient reduction levels. Although temperature has a significant impact on denitrification, the model does not consider tile water temperature. This study introduces a process-based, daily time step, bioreactor simulation model that incorporates water temperature from DRAINMOD simulation with historical weather data. This model has a user-friendly interface, developed in Microsoft Excel using Visual Basic for Applications (VBA).