Optical sensors are promoted as a technique to monitor in-season nitrogen status of cereal crops, especially corn. This webinar will introduce CCAs to various sensors and the factors to consider in order to interpret the sensor output.

Drawing on over 100 on-farm trials in corn, cotton, and wheat, factors favoring success will be laid out along with factors favoring failure. Sensor-based N management will be compared to producer-chosen N rates in terms of yield, N expense, and profit.

CCA/CPAg: 1.0 Nutrient Management
CPSS/CPSC: 1.0 Professional Meeting

Speaker Information:
Peter Scharf, PhD
Professor and Nutrient Management Specialist
University of Missouri

Peter Scharf has spent 30 years studying nitrogen.  The vast majority of his research has been conducted on private farms, with over 200 on-farm field-scale studies and an additional 200 on-farm small-plot studies.  Some of these studies showed that the most profitable rate of N fertilizer for corn varies widely within a field, leading him to pursue ways to manage that variability.  He has concluded that corn color is a much more accurate predictor of the best N rate than any pre-plant diagnostic, and that canopy sensors are an excellent way to harness science in service to better farming.  He is also a strong advocate of using aerial imagery to evaluate and correct N loss in wet years, having seen a tremendous amount of yellow corn across the Midwest over the past seven years. After getting a BS at University of Wisconsin, He obtained his MS in Agronomy and PhD in Crop and Soil Environmental Science from Virginia Tech.

John Shanahan, PhD
Agronomy Research Manager
DuPont Pioneer 

John Shanahan has spent his entire career working toward developing and providing growers with improved agronomic management solutions to increase profitability and reduce risk. He began his career as a professor and extension specialist with Colorado State University, and later joined USDA-ARS, working as a Research Agronomist at the University of Nebraska. He is currently an Agronomy Research Manager with DuPont Pioneer where he is responsible for coordinating Pioneer-sponsored agronomic research projects with university collaborators across North America.  He is also responsible for providing support to the Pioneer agronomy team on development of research trial protocols for on-farm agronomic studies conducted with growers across North America.  

He received a BS in Agronomy from University of Nebraska and an MS and PhD from Colorado State University.  His major fields of interest are agronomy, crop genetics and physiology, remote sensing, soil science and precision agriculture technologies. He has used his expertise in these areas to help develop remote sensing and other Precision Ag tools for diagnosing crop stresses and improving crop nitrogen management.   Dr. Shanahan has reported research results in numerous industry articles, peer-reviewed publications, book chapters, conference proceedings, extension publications, and popular press articles. He has delivered many presentations to sales professionals, growers, consultants, extension educators, and government personnel. He is member of the tri-societies (ASA, CSSA, and SSSA) and International Precision Ag Society, serving on editorial boards for these societies as well as being elected Fellow of American Society of Agronomy.

$25.00 Members/Certified Professionals
$40.00 Non-members

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Seminar Information
Date Presented:
November 24, 2014 1:00 PM Eastern
1 hour
Canopy Color Detection as a Proxy for N status
Speaker Information
Dr. Peter Scharf   [ view bio ]
Dr. John Shanahan   [ view bio ]
Individual topic purchase: Selected
American Society of Agronomy
Nutrient Management : 1.00
Soil Science Society of America
Professional Meetings: 1.00
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