* Nutrient management of humid, temperate region forages: Recommendations and practices, plenary paper in Soil Fertility Theme at the 18th International Grassland Congress, Winnipeg, Manitoba, June 1997.
* Nutrient cycling in pasture systems, plenary paper at the International Symposium on Animal Production Under Grazing, University of Vi?osa, Vi?osa, Brazil, November 1997.
* Survey results of forage nutrient management on Minnesota farms, Wisconsin Forage Council, Appleton, Wisconsin, January 1999.
* N and P cycling in pasture, Soil Ecology Workshop, Lancaster, Wisconsin, August 1999.
* Perennial forages provide an economical way to remove inorganic N from ground water and soil, State Government Approaches to Pesticide and Fertilizer Cleanups, September 1999.
* Application of dairy manure to alfalfa -- Issues and techniques, California Alfalfa Symposium, Fresno, California, December 1999.
* Nitrogen cycling in pasture systems, Advanced Grazing School, Linneus, Missouri, June 2000.
* Balancing cows and crops to recycle nutrients, 20th Anniversary of the US Dairy Forage Research Center, 2001.
* Alternative crop management strategies, First Agricultural Drainage Field Day, Lamberton, MN, 2002.
* Perennial forages: Preserving your future, Am. Forage and Grassland Conf., 2002.
* Nutrient management in alfalfa-corn silage rotations, 4-State Forage Conf., Wisconsin, 2003.
* Principles of nutrient cycling in grassland agriculture, in the ASA meeting symposium ?Whole-farm perspectives of nutrient flows in grassland agriculture,? Nov. 2003.
* Frequently present invited talks to farmers and agricultural advisors at Field Days and Pasture Walks.
* Occasionally present invited lectures to graduate classes.
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