Title: Zones vs. Grid
Date: Wed Jul 18, 2018
Time: 8:00 AM - 10:00 AM
Moderator: Terry Brase
Management Zones & Precision Nitrogen Management

Nitrogen (N) is one of the most important element for crop production because it is required by plants in the largest quantity. Depending upon crop species, it may vary from 1-5% of total plant dry matter.  Nitrogen is an integral component of proteins, nucleic acids, chlorophyll, co-enzymes, phytohormones, and metabolites. Atmospheric N, is not readily available to most plants.  The availability of N in soil varies significantly in time and space.  This variability is driven by soil properties such as texture, ph, moisture, and microbial activity. The challenge for precision N management is to account for all available sources of N and synchronize it with the crop N need in all: place, time, and amount. How do we overcome this challenge will be discussed in this presentation with a focus on precision N 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
Do We Have Soil Test Recommendations Precise Enough to Support Precision Agriculture?

Soil testing encompasses the process of collecting soil samples, having them analyzed, and then interpreting the results to make fertilizer recommendations. This process attempts to provide information on the amount of nutrient present and its availability to the crops. We should soil test at a spatial resolution matching that of our nutrient application. We typically determine this resolution based on equipment capabilities and the size of zones within a field that can be managed uniformly. However, we typically focus on collecting soil samples at the appropriate resolution, through zone or grid sampling, but ignore the resolution at which scientists developed recommendations. We will discuss soil test correlation and calibration, the resulting recommendations, and the need to update recommendations to support site specific nutrient management.

Joshua McGrath (speaker)
Associate Professor & Extension Specialist
University of Kentucky
Lexington, KY 40546-0091
Dr. Josh McGrath joined University of Kentucky’s faculty in 2014 after spending eight years at the University of Maryland focused on agriculture and the Chesapeake Bay. Josh’s research and extension activities concentrate on agricultural productivity, with emphasis on water quality, nutrient use efficiency, and precision agriculture. Dr. McGrath routinely speaks throughout the United States on issues related to agriculture and the environment as well as precision agriculture. Dr. McGrath was born and raised in Smyrna, Delaware, graduated with a BA from Johns Hopkins University, earned his Ph.D. from University of Delaware, and conducted post-doctoral research at Virginia Tech. When not talking about or researching soil fertility Josh enjoys hunting and fishing and has been a volunteer firefighter for over 25 years.
Length (approx): 40 min
Adaptive Sampling Strategy

Blending the techniques of grid and zone sampling to better understand and react to how ALL of your soil response to fertilizer management strategies. 

Brian Arnall (speaker)
Professor Precision Nutrient Management
Oklahoma State University
Stillwater, OK 74078

Dr. Arnall’s extension, teaching, and research efforts are focused on precision technologies and nutrient management in all of Oklahoma’s cropping systems with an emphasis in site specific techniques.  He works closely with extension educators and industry personnel to improve nutrient management practices in Oklahoma that will lead to increased profitability of Oklahoma producers.  He currently has several ongoing studies focused at the developed of methods to use sensor based technologies, nitrogen fertilizer timing and placement, increasing nutrient use efficiency, and improvement phosphorus fertilizer recommendations. In addition Brian has a crew of developers producing iOS and Andriod applications

Length (approx): 40 min