AGVISE Soil Fertility Seminars
Each year, the AGVISE Soil Fertility Seminars bring together farmers, crop consultants, agribusiness retailers, and researchers to share the latest in soil fertility, plant nutrition, and other agronomic issues that challenge our region. The seminars include a full day of invited speakers, lunch, and printed presentation guide. The United States and Canada seminars are held each January and March, respectively. This is not an event you will want to miss!
Upcoming Seminars
USA Seminar Series
The 2027 seminar schedule and registration will be shared in November 2026. Mark your calendar for these dates!
- January 5, 2027: Willmar, MN
- January 6, 2027: Watertown, SD
- January 7, 2027: Grand Forks, ND
Canada Seminar Series
The 2026 seminars are now complete. The presentation slides are archived below. The 2027 seminar dates will be announced later.
2026 USA Seminar Presentations
2026 Canada Seminar Presentations
Tom Bruulsema – 4R Practices, Real Outcomes
Curtis Cavers – Increasing Soil Organic Carbon on Eroded Hilltops: Build or Borrow?
Chris Holzapfel – Applied Fertility Research Highlights: Nitrogen, Phosphorus, and Beyond
John Breker – Soil Salinity: Annual Problems, Perennial Solutions?
Jed Grow – AGVISE Project: Long-term Elemental Sulfur (Canada version)
2025 USA Seminar Presentations
Jason Clark – Soil Fertility and Soil Health Testing: Is There a Connection?
Marla Riekman – Tackling Salinity for Productive Soil Management
Melissa Wilson – Improving Manure Management with New Acres and New Applications
John Breker – To Band or Broadcast: A Long-Term Look at Soil Fertility Management
2025 Canada Seminar Presentations
Lyle Cowell – Potassium for the Canadian Prairies
Stephen Crittenden – Soil Health Indicators for Prairie Cropping Systems
Rigas Karamanos – Optimizing Fertilizer Economics on the Prairie
John Breker – AGVISE Project: Long-term P & K, Long-term Elemental Sulfur (Canada version)
Brent Jaenisch – Intensive Wheat Production: How to Manage the Source and Sink
2024 USA Seminar Presentations
Jodi DeJong-Hughes – Soil Erosion: What is Tillage Costing You?
Fabian Fernandez – Managing Soil Fertility in Strip-Till Fields for Corn and Soybean Production
David Franzen – Sulfur Sources, Chemistry, Deficiencies, and Considerations for Application
Barney Geddes – Maximizing Nitrogen Fixation between Rhizobia and Legume Crops
2024 Canada Seminar Presentations
Don Flaten – Predicting Crop Response to Fertilizer, Not as Simple as Some People Think
Phillip Harder – Managing Crop-Soil-Water Interactions on the Canadian Prairies
Sarah Lovas – Precision Soil Sampling: Who Grids, Who Zones, Who Cares?
Jeff Schoenau – Improving Soil Health, Productivity, and Fertility on Prairie Soils
Mario Tenuta – Soybean Cyst Nematode Here in Manitoba
Mario Tenuta – Update on 4R Nitrogen Studies: Rate, Source, Placement, Timing
2023 USA Seminar Presentations
John Jones – Phosphorus and Potassium: A Fresh Look with Fresh Data
Daniel Kaiser – Sulfur: More than Rate and Timing, Choose the Right Source Too
David Lobb – Soil Erosion and Soil Fertility: Myths and Realities
Jodi Boe – Soils, Pesticides, and pH: Interactions and Management
John Breker – Soil Test Correlation and Calibration: What Does That Actually Mean? (USA version)
2023 Canada Seminar Presentations
Rigas Karamanos – The Good, the Bad, and the Ugly of Soil and Crop Amendments
Marla Riekman – Soil Erosion: Don’t Just Stop It, Fix It!
Jodi Boe – Soils, Pesticides, and pH: Interactions and Management
John Breker – Soil Test Correlation and Calibration: What Does That Actually Mean? (Canada version)
Brent Jaenisch – AGVISE Project: Long-term P & K, Long-term Elemental Sulfur (Canada version)
2022 USA Seminar Presentations
R. Jay Goos – Nitrogen Fertilizer Additives: The Domino Theory
R. Jay Goos – Soybean Iron Deficiency Chlorosis – Symptoms, Causes and Control
John Heard – Crop Nutrient Uptake and Removal – Are all regions the same?
Josh McGrath – How to Decide a Nitrogen Rate: Empirical, Mechanistic, or Faith-based?
Jodi Boe – Soil Amendments, Soil pH, and %K Saturation
John Breker – Managing Nitrogen after Drought (USA version)
John Breker – Quantifying Soil Carbon: A Field and Laboratory Perspective
Brent Jaenisch – AGVISE Project: Soybean Cyst Nematode (SCN) Resistance
2022 Canada Seminar Presentations
John Heard – Crop Nutrient Uptake and Removal: Are all regions the same?
Chris Holzapfel – 4R Nutrient Management Trials: How do we choose the right Rs?
Rigas Karamanos – Contemporary Soil Fertility Issues
Jodi Boe – AGVISE Project: Long-term P &K, Long-term Elemental Sulfur, No-till Lime
Jodi Boe – Soybean Cyst Nematode (SCN) in Manitoba and SCN Resistance Management
John Breker – Managing Nitrogen after Drought (Canada version)
John Breker – Quantifying Soil Carbon: A Field and Laboratory Perspective
2020 USA Seminar Presentations
Brian Arnall – Precision Ag and Moving from Accurate to Precise
Tom DeSutter – Dispersed Attitudes: I’m tiling this country and you can’t stop me!
Jeffrey Vetsch – Nitrogen Management: Balancing Production, Profitability, and Water Quality
Melissa Wilson – Manure Happens: Take credit and cover it up
John Breker – Soil Health Testing: Can You Manage What You Measure?
2020 Canada Seminar Presentations
The 2020 Canada Seminar was cancelled due to the COVID-19 Pandemic.
2019 USA Seminar Presentations
Caley Gasch – Soil Aggregate Stability: Tillage, Rotations, and Cover Crop Effects
Heidi Peterson – Phosphorus Management Challenges Confronting the Midwest
Jochum Wiersma – Wheat: How Much Appetite for Risk (and Reward) Do You Have?
John Lee – Soil Sampling Equipment and Soil Sample Quality: Soil Probe Tips and Tricks
2019 Canada Seminar Presentations
Megan Bourns – Soybean Response to Potassium in Manitoba
Don Flaten – Review of 4R P Fertilizer Management on the Northern Great Plains
Adam Gurr – Controlled Traffic Farming, On-farm Research, and New Phosphourus Management Program
Les Henry – Fertility of Saskatchewan Soils: From Plough to Now
Amy Mangin – Managing Wheat Lodging Risk through Agronomic Management
Jeff Schoenau – Update on Micronutrient Deficiencies and Responses in Prairie Soils
Cory Willness – Zone Creation with Soil, Water, and Topography Maps
John Lee – Soil Sampling Equipment and Soil Sample Quality: Soil Probe Tips and Tricks
2018 USA Seminar Presentations
Don Flaten – Phosphorus Management: Questions of Balance
Dan Kaiser – Sulfur Use in Western Minnesota: What We Know and What We Don’t
Jerome Lensing – Discover Farms Minnesota: N and P, What is Happening in Farm Fields
John Breker – Potassium for Corn: Soil Testing and Crop Response Inconsistencies
John Lee – Soil Amendments and Myths for the Northern Great Plains
2018 Canada Seminar Presentations
Megan Bourns – Soybean Response to Potassium in Manitoba
Steve Crittenden – A Soil Quality Story from the Netherlands
Don Flaten – Estimating the Nitrogen Supplying Power of Manitoba Soils
Rigas Karamanos – Beyond N and P Eight Years Later: What’s Changed?
Lanny Gardiner – 4R N Fertilizer Management for Corn
Amy Mangin – 4R N Management for High-yielding Spring Wheat
Mario Tenuta – Soybean Cyst Nematode: Coming to a Field Near You?
John Breker – Managing Soybean Iron Deficiency Chlorosis (IDC) with Soil Testing
2017 USA Seminar Presentations
Greg Endres – CREC Fertilizer Research Summary, Corn
Greg Endres – CREC Fertilizer Research Summary, Dry Bean
Greg Endres – CREC Fertilizer Research Summary, Soybean
Fabian Fernandez – Precision Soil Testing for Corn: Spatial, Temporal, and In-season Options
Tom Jensen – IPNI Soil Test Summary of North America 2015
Hans Kandel – Raised Beds for Soybean Production
George Rehm – 4Rs Nutrient Management and Water Quality
Bob Deutsch – History of AGVISE Laboratories, 40th Anniversary
Bob Deutsch – Soil Health and the Haney Soil Health Test
John Lee – AGVISE Project: Using Sugar Beet Lime on Acidic Soils
John Lee – AGVISE Project: Movement of Phosphorus and Potassium in Soil
John Lee – AGVISE Project: Soil Water Flow in Sodic Soils with Gypsum and Lime
2017 Canada Seminar Presentations
Don Flaten – Updating Nitrogen Recommendations for Spring Wheat
John Heard – Nitrogen Fertilization for Spring Wheat
John Heard – Nitrogen Fertilization for Corn
Rigas Karamanos – In-season/ Post-emergence Fertilizer Options, Macros and Micros
Amy Mangin – Nitrogen Management for High-yielding Spring Wheat
Magda Rogalsky – Nitrogen, Phosphorus, and Zinc Fertilizer, Placement, and Tillage for Corn
Mario Tenuta – Managing Nitrogen to Reduce Nitrous Oxide Emissions
John Breker – Potassium for Corn: Soil Testing and Crop Response in North Dakota
John Lee – History of AGVISE Laboratories, 40th Anniversary
John Lee – Soil Health and the Haney Soil Health Test
John Lee – AGVISE Project: Movement of Phosphorus and Potassium in Soil
John Lee – AGVISE Project: Soil Water Flow in Sodic Soils with Gypsum and Lime
2016 USA Seminar Presentations
Dorian Gatchell – Future of Soybean Cyst Nematode (SCN)
Sarah Lovas – Precision Ag and Soybean Iron Deficiency Chlorosis (IDC)
Sarah Lovas – Grids vs Zones: Why Can’t We Just Get Along?
Gyles Randall – 4R Nitrogen Management and Water Quality
Dennis Todey – Climate Change and Mitigating Production Risks in Agriculture
Richard Jenny – AGVISOR Tips and Tricks
John Lee – AGVISE Project: Soil Sampling after P & K Fertilization in Soybean Fields
2016 Canada Seminar Presentations
Don Flaten – Phosphorus Fertilization for Corn and Soybean in Manitoba
John Heard – Nitrogen Management for High-yielding, High-protein Spring Wheat
Rigas Karamanos – Phosphorus and Potassium Management in Western Canada
Sarah Lovas – FeEDDHA Fertilizer Working in the Real World
Sarah Lovas – The Exciting World of Chelation
Mario Tenuta – Soybean Cyst Nematode (SCN) in Manitoba
John Lee – AGVISOR Tips and Tricks
John Lee – AGVISE Project: Soil Sampling after P & K Fertilization in Soybean Fields
John Lee – AGVISE Project: Remediating Sodic Soils 2008-2015
2015 USA Seminar Presentations
Sarah Lovas – FeEDDHA Fertilizer Working in the Real World
Sarah Lovas – The Exciting World Of Chelation
Gyles Randall – Managing P & K for Corn and Soybean
Kelly Sharpe – Using RTK vs. LiDAR for Drainage
Kelly Sharpe – A VRT View from 30,000 Feet
Abbey Wick – Building Soil Biology with Crop Rotations
Abbey Wick – Soil Biology and Nutrient Cycling
Richard Jenny – AGVISE Project: Yellow Corn Comparison and Plant Sampling Time of Day
2014 USA Seminar Presentations
2013 USA Seminar Presentations
Jodi DeJong Hughes – Getting to the Bottom of Shallow Tillage
Jodi DeJong Hughes – Land Rolling: What Happens to Water Infiltration?
Scott Murrell – Attaining Higher Corn Yields
George Rehm – The Challenge: Sorting Fact from Fiction or Separating Reality from Recycled Trash
George Rehm – Discovery Farms Minnesota
Gary Wagner – Articulating Knowledge in Agriculture: A Farmer’s Experience with Precision Ag
Jochum Wiersma – Do Small Grains Fit into Future Crop Rotations?
Richard Jenny – AGVISE Project: Corn Plant Analysis and Sampling Date Comparison 2012
John Lee – AGVISE Project: Troubleshooting Problems with Plant and Soil Samples 2012
2012 USA Seminar Presentations
Shawn Kasprick – Using EC / EM for Salinity and Zone Development
Nathan Kosbau – Precision Ag Theory
George Rehm – Conservation Tillage and Changes for Fertilizer Management
George Rehm – Changes in Nitrogen Management
John Lee – Managing Prevented Planting and Unplanted Acres 2011
John Lee – AGVISE Project: Tile Drainage and Saline Soils 2002-2011
John Lee – AGVISE Project: Wheat Flag Leaf Nitrogen Sampling for Protein
2011 USA Seminar Presentations
2010 USA Seminar Presentations
Greg Endres – Tillage and Fertilizer Placement for Corn
Greg Endres – Tillage and Fertilizer Placement for Dry Bean
Greg Endres – Tillage and Fertilizer Placement for Soybean
Wade Marzahn – Using Topography and Veris in Zone Management
Jim Millar – Creating Soil Management Zones to Make Variable Rate Technology Profitable
Jochum Wiersma – Wheat Grain Yield and Protein: Can You Get Both?
Richard Jenny – Soybean Cyst Nematode (SCN) Summary 2010
John Lee – AGVISE Project: Remediating Sodic Soils 2008-2009