Nitrogen Speaker Series and Roundtable Talks

ASI and the California Nitrogen Assessment have hosted a number of distinguished guests as part of our Nitrogen Speaker Series and Roundtable Talks.

Thursday, February 24, 2011


Dr. Rodney Venterea
USDA-ARS Soil Scientist; Adjunct Assistant Professor, Department of Soil, Water, & Climate, University of Minnesota; Associate Editor, Journal of Environmental Quality

The leaking soil nitrogen cycle and rising atmospheric N2O: Is there anything we can do to cap the well?

Rodney Venterea received a PhD in Soil Science from the department of Land, Air, and Water Resources (LAWR) at UC Davis in 2000.  He was a post-doctoral research associate with the Institute of Ecosystem Studies until 2002, when he joined the USDA Agricultural Research Service (USDA-ARS), and department of Soil, Water and Climate at the University of Minnesota in St. Paul where he is currently a research soil scientist and adjunct faculty member.  His main interests are measurement, mitigation, and modeling of soil greenhouse gas emissions and soil N cycling in agricultural and forest soils.

Download the event flier here. (PDF)

Wednesday, January 19, 2011


Mike Barton
Lake Taupo Protection Trust
Waikato Region, New Zealand

A cap on nitrogen emissions: a farmer's perspective

Mike is a beef farmer and a trustee of the Lake Taupo Protection Trust—a group involved in the implementation of the Lake Water Quality legislation (RPV. 5), which is one of the first mandatory non-point source trading programs in the world. The Trust is charged with removing 20% of the leached nitrogen from the Lake Taupo catchment by 2018 by changing farmland to lower leaching land.

Download the event flier here. (PDF)

Wednesday, November 17, 2010

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Dr. Alan Townsend
Director, Environmental Studies Program, University of Colorado;
Professor, Department of Ecology and Evolutionary Biology, and Institute of Arctic and Alpine Research (INSTAAR)

Is it limiting or not?  Revisiting the tropical forest nitrogen cycle and its implications for human-driven environmental change

 Dr. Townsend serves on the Ecological Society of America’s (ESA) Rapid Response Team, a group that provides environmental information to policy-makers at both state and national levels.  He wrote an article for the February 2010 edition of Scientific American entitled "Fixing the Global Nitrogen Problem."

Download the event flier here. (PDF)

Monday, August 9, 2010


Dr. Jorge Delgado
Research Soil Scientist, USDA-ARS Soil Plant Nutrient Research Unit, Fort Collins, Colorado

The Nitrogen Index

Dr. Delgado led the development of the Nitrogen Index tool,  designed to help nutrient managers quickly assess N loss risk related to agricultural N management. More information about the Nitrogen Index, including a link to a free download, is available here.

Download the event flier here. (PDF)

Wednesday, June 23, 2010

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Dr. Kenneth Cassman
Director, Nebraska Center for Energy Sciences Research;
Heuermann Professor of Agronomy, University of Nebraska, Lincoln

Watch a video of our conversation with Dr. Cassman, where he talks about the importance of nitrogen to the global food supply, as well as some of the important tradeoffs involved in feeding the world. (2:43)

Download the event flier here. (PDF)

Tuesday, February 9, 2010


Dr. Steven Hamburg
Chief Scientist, Environmental Defense Fund (EDF)

Download Dr. Hamburg's Presentation (PPT) from his visit to ASI in February 2010.

Watch a video of our conversation with Dr. Hamburg. EDF has identified nitrogen as one of their important emerging issues of focus, and Hamburg explains why. (1:22)

Download the event flier here. (PDF)

Wednesday, October 14, 2009

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Dr. Peter Vitousek
Professor, Department of Biology, Stanford University; Senior Fellow, Woods Institute;
Clifford G. Morrison Professor in Population & Resource Studies; Senior Fellow (by courtesy), Freeman Spogli Institute

Download Dr. Vitousek's Presentation (PPT) from his visit to ASI in 2009.

Watch a video of our conversation with Dr. Vitousek, where he talks about the benefits and challenges of agricultural nitrogen fertilizer and its impact on human health and the environment. (2:43)