Title: Nitrogen
Date: Tue Jul 17, 2018
Time: 3:40 PM - 5:40 PM
Moderator: Tai McClellan Maaz
Site-Specific 4R Considerations When Using Enhanced Efficiency Fertilizers

details coming soon

Mario Tenuta (speaker)
Professor of Applied Soil Ecology
University of Manitoba
Mario is a Professor of Applied Soil Ecology at the University of Manitoba. His training includes a B.Sc. in Botany and Physical Geography, a M.Sc. in Soil Science, a Ph.D. in Plant Sciences, and Post-Doctoral research in Nematology. Mario leads The Soil Ecology Laboratory at the University of Manitoba. From 2006 to 2016 he served as the Canada Research Chair in Applied Soil Ecology. The laboratory tackles applied questions to give farmers and industry solutions to increase profitability while improving soil and environmental health. Together with many colleagues, his team has addressed many soil related issues, including; improving nitrogen use efficiency of crops, mitigation of greenhouse gas emissions, documenting the benefits of 4R nutrient management practices, development of rapid molecular tests and field surveys of emerging soilborne diseases and nematode pests of crops, and comparison of sustainability of production systems on the Canadian Prairies.
Length (approx): 40 min
Uncertainty With Weather and Soil Interactions: The Source of Fickle Correct Corn Nitrogen Rates

Despite the extensive effort devoted to developing tools for making corn N fertilizer recommendations, most tools have not proven to perform well over a wide range of soils and climate conditions. Research in recent years is showing how important with-inseason weather and site-specific soil information is for making better estimations of crop N need for any given year. The presentation will show how well the tools and soil and weather-adjusted tools performed for making corn N recommendations. Findings will help guide future development of N fertilizer recommendations that are responsive to both spatial and temporal variability between and within crop production fields.


Newell Kitchen (speaker)
Soil Scientist
USDA- Agricultural Research Service Cropping Systems and Water Quality Research Unit
Columbia, MO 65211-5200
Newell Kitchen is a Soil Scientist with USDA ARS and Adjunct Associate Professor at the University of Missouri. He received his B.Sc. degree from Brigham Young University, M.Sc degree from University of Missouri, and his Ph.D. (1990) degree in Agronomy from Colorado State University. Dr. Kitchen Recognized for his research in integrated agricultural systems as related to precision agriculture systems, soil and water quality in agroecosystems, and nutrient management for improved fertilizer use efficiency. His research is documented in 300 technical publications (including over 110 peer-reviewed journal articles). He served as the 2011 President of the American Society of Agronomy (ASA).
Length (approx): 40 min
Know Your Yields! Importance of Accurate Yield Records for N Management Algorithms for Corn

Although there typically is a poor relationship between yield and optimum N rates for corn across diverse sets of fields, many N management algorithms and models include yield estimates as part of the equations. Yield predictions are used to determine end-of-season yield and estimate total N uptake. This is important as information on total N uptake, together with estimates of soil N supply through organic matter mineralization, crop rotation credits, manure-based N supply, and losses of N from application to close to crop harvest are important inputs for N management. Here we focus on two questions: (1) how important is it to be able to accurately predict yield for within-field N management for corn?; and (2) how can we most accurately assess and predict yield in the first place?

Quirine Ketterings (speaker)
Professor of Nutrient Management
Cornell University, Department of Animal Science
Ithaca, NY 14853

Quirine Ketterings joined Cornell University in fall 2000 to provide leadership for the field crops nutrient management extension and applied research program of the College of Agriculture and Life Sciences. Quirine received her BSc from Agricultural College Deventer and MSc from Wageningen University, both in the Netherlands, and her PhD from Ohio State University. She established and leads the Cornell Nutrient Management Spear Program (NMSP,, the college’s applied research, teaching and extension program for field crop fertilizer and manure management, that aims to (1) improve dairy industry awareness of soil fertility management, and (2) aid in the development and implementation of agronomic and environmentally sound nutrient management practices at dairy and other livestock farms and cash grain operations.

Length (approx): 40 min