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
Fort Collins, CO 80523-1170
Dr. Raj Khosla is a Robert Gardner Professor of Precision Agriculture at Colorado State University. His main research focus has been on management of in-field soil and crop variability using geo-spatial technologies for precision management of crop-inputs. 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. Most recently, he was recognized with the Werner L. Nelson Award for Diagnosis of Yield-Limiting Factors by American Society of Agronomy. Previously, in 2015, he was recognized as the “Precision Ag Educator of the Year”, a national honor bestowed by the agricultural industry and in 2012, he was named the Jefferson Science Fellow by the National Academy of Sciences. Previously, he has served two 2-yr terms on NASA’s US “Presidential Advisory Board on Positioning, Navigation and Timing”. He is a Fellow of the American Society of Agronomy; Soil Science Society of America; Soil and Water Conservation Society; and Honorary Life Fellow of International Society of Precision Agriculture. He is the Founder and Founding-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
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
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