1. Drainage Management and Nitrogen Loss

Nitrate-N loss through subsurface agricultural draina ge is of local and regional concern in the Midwest. Good drainage and nitrogen management practices have the potential to reduce nitrate- N concentrations and loss from subsurface drainage systems. The five year (2005-2009) nitrogen management study in Pocahontas County, IA suggests that while fall application of fertilizer may result in higher nitrate-N concentrations than spring application during certain period of the growing season; overall,...