Effect of different land covers on nitrate-nitrogen leaching and nitrogen uptake in Iowa

Nutrient Loading Reduction In A Tile Drained Agricultural Watershed Through Watershed-Scale Cover Cropping: A High Resolution Analysis

“…Strock et al (2004) found more a more modest reduction of 13% using cereal rye in a three-year Minnesota study, which may be indicative of the reduced efficacy of cover crops in colder areas. Qi et al (2008) in a two-year Iowa study, found a reduction of up to 21.7% in flow-weighted NO3-N concentrations one year, but no statistically significant difference was found in the other year of the study. David et al (2015), in a paired field scale study of a tile-drained system in Illinois, found a reduction of 34% in tile nitrate yield.…”

“…Most cover cropping studies have been performed on a plot scale (Kaspar et al 2012, Rasse et al 2000, Fraser et al 2013, Drury et al 2014, Zhu et al 1989, O'Reilly et al 2011, Dean and Well 2009, Kaspar et al 2001, Johnson et al 1998, Moore et al 2014, De Baets et al 2011, Kaspar et al 2007, Kaspar et al 2012, Williams and Weil 2004, Qi et al 2008, Olson et al 2014, Kladivko et al 2004, Ball Coelho et al 2005, where treatments are applied on small plots of land, usually in the range of 1-5 acres. At these plots, factors such as the timing and method of planting, harvesting, and fertilization are tightly controlled.…”