Nutrient management guidelines
University of Minnesota Extension's website on nutrient management includes news, research, a crop calculator, and various resources describing nutrient management guidelines and best practices.
Legume N credits
Article from Forage Quarterly, January 2015.
How accurate are plant and soil tests at predicting the need for nitrogen in corn following alfalfa?
Article from Clippings, January 13, 2015.
Article from Clippings, June 16, 2014. (28 K PDF)
Article from Hay and Forage Grower, January 2014. (253 K PDF)
Recent studies help determine when first- or second-year corn following alfalfa might respond to fertilizer nitrogen. 2014
Crop News, 2013
Summary of 31 on-farm trials that evaluated various N rates and time of application in first-year corn following alfalfa, along with an evaluation of no-till in first-year corn. 2012 (4.5 MB PDF)
With late-season flooding and hail, there may be questions on whether a credit can be taken from soybeans not harvested for the next year's crop. Crop News, 2010.
Results of on-farm experiments meant to validate the University of Minnesota's N-credit guidelines, presented in Forage Quarterly, 2010. (282 KB PDF)
Resources aimed to develop an understanding of rotation effects created by legumes, and the influence legumes have on N fertilizer management programs. 2008.
The University of Minnesota's site for manure management and air quality, including resources on manure applications, pathogens, and manure management basics.
The manure management site from the University of Minnesota's Dairy Extension, including rules and regulations, manure management plans, and other recommended resources.
Results from a southwest Minnesota monitoring project and the application of the Minnesota Phosphorus Index, with the objective to study the potential for nutrient build-up in soils with swine manure applications. 2007.