Title: Nitrogen Management
Date: Tue Jul 25, 2017
Time: 1:00 PM - 3:00 PM
Moderator: Jim Pollock
Nitrogen Management: Past, Present, and the Future

Nitrogen holds the first rank among all essential nutrients applied to the crops worldwide. The invention of synthetic Nitrogen fertilizer over a century back (early 1900s) led to dramatic increase in grain yields and global green-revolution. Yet after a >100 years of progress we haven’t attained the level of 50% global nitrogen use efficiency. I cannot think of any other operation or process in agricultural industry that tolerates 50% or lower efficiency rates. We have long ways to go in achieving 5-R Precision Stewardship. What would it take? Can data-driven nitrogen management be the solution? This presentation will provide a holistic approach to Past, Present, and the Future of Nitrogen management.

Raj Khosla (speaker)
Professor of Precision Agriculture
Colorado State University
Dept. of Soil and Crop Sciences
Fort Collins, CO 80523-1170
(970) 491-1920
Prof. Raj Khosla is Robert E. Gardner Professor of Precision Agriculture at Colorado State University (CSU). In addition, he holds the title of CSU distinguished Monfort Professorship. In 2015, Dr. Khosla was recognized as the “Precision Ag Educator of the Year 2015”. Previously, in 2012, Dr. Khosla was named the Jefferson Science Fellow by the National Academy of Sciences and was appointed as the Senior Science Advisor on Food Security to the U.S. Department of State. In 2011, he was inducted by NASA to the US “Presidential Advisory Board on Positioning, Navigation and Timing” to work on the US space based GPS policy. His main research focus has been on “Management of in-field soil and crop spatial variability using innovative technologies (such as Global Positioning Systems or GPS, Geographic Information Systems or GIS, and Remote-sensing) for variable rate precision nutrient management, particularly Nitrogen. He has generated many discoveries in precision agriculture, most widely recognized among them is the innovative technique of quantifying variability of spatially diverse soils using satellite based remote-sensing to create management zones, which is currently being used by farmers in Colorado, across US and in other countries around the world. He currently has projects in multiple countries and is championing efforts to enhance crop input use efficiency, productivity, profitability, and sustainability of large and small scale agricultural production systems. He has co-authored over 300 publications (book chapters, refereed journal articles, extension articles, proceedings, bulletins, reports, popular press articles, digital media, and others). He has been invited globally to over 30 countries. Dr. Khosla is the Fellow of American Society of Agronomy; Fellow of Soil Science Society of America; Fellow of Soil and Water Conservation Society and Honorary Life Fellow of International Society of Precision Agriculture. He is the Founder and Past-President of the International Society of Precision Agriculture.
Length (approx): 40 min
Changing Nutrient Needs with Variable Rate Seeding and Other Sub-field Management Strategies

Crop nitrogen need is directly related to yield potential and increases with higher production.  Spatial variation in crop yield across fields is well known and new technologies that allow on-the-go changes to plant population and even hybrid provide the best opportunity yet to optimize inputs.  However changes in plant population also affect nutrient need.  Discussions will focus on how the use of sub-field management changes, such as variable population, affect nitrogen needs and dynamics.  Pros and cons of various N management strategies in response to other sub-field management decisions will also be covered. 

Wade Thomason (speaker)
Virginia Tech
422 Smyth Hall, 185 Ag Quad Lane (0404)
Blacksburg, VA 24061
Dr. Thomason is a Professor and the Extension Grain Crops Specialist for the commonwealth of Virginia. In this role, he provides state-wide leadership for extension and research programs in production and management of corn and small grains. He holds an M.S. in agronomy and Ph.D. in soil science from Oklahoma State University.
Length (approx): 40 min
Nitrogen management: site-specific strategies to balance agronomic and environmental goals

Nitrogen management: Using site-specific strategies to balance agronomic and environmental goals of winter wheat production in the inland Pacific Northwest

Fertilizer management is challenging in the inland Pacific Northwest USA because of its rolling landscape and variable climate. Winter wheat yield goals vary greatly within and across fields, and so a one-size-fits-all approach to nitrogen fertilizer management is inefficient. Site-specific fertilization strategies are needed to match nitrogen supply with variable crop demand. Like elsewhere, the region has adopted a three-pronged approach that involves (1) the implementation of precision agriculture technologies, (2) the utilization of spatial soil, terrain, and crop data to predict crop performance, and (3) the evaluation of site-specific practices. This presentation will feature the regional application of remote sensing and other technologies to collect georeferenced crop and soil data, which is then used to assess crop performance and create site-specific fertilizer management plans. The presentation will also highlight evaluation tools being developed to establish nitrogen use efficiency thresholds for meeting agronomic and environmental goals. 

This talk was prepared with co-authors: Dave Brown (Washington State University) and Erin Brooks (University of Idaho)

Tai McClellan Maaz (speaker)
Nitrogen Program Director
Washington State University, IPNI
PO Box 646420
Pullman, WA, NA 99164-6420
Dr. Tai McClellan Maaz is the newly appointed director of IPNI’s nitrogen program. Prior to the IPNI, Tai was a USDA-NIFA Post-doctoral Fellow at Washington State University in Pullman, Washington. She received her Ph.D. in soil science from Washington State University, and her M.S. and B.S. from the University of Hawaii at Manoa-Tropical Plant and Soil Sciences. As a Ph.D. student, she received training in the National Science Foundation (NSF) Integrated Graduate Education Research Training (IGERT)’s Nitrogen Systems: Policy-oriented Integrated Research and Education (NSPIRE) program. In 2013, she was a recipient of the IPNI Scholar Award.
Length (approx): 40 min