Regenerative Agriculture Podcast

Jerry Hatfield earned his PhD in agricultural climatology from Iowa State University and worked at UC Davis before spending his career with USDA's Agricultural Research Service. He led the National Laboratory for Agriculture and the Environment in Ames, Iowa, for about 25 years. He has written nearly 500 research papers and was inducted into the ARS Science Hall of Fame in 2014.
Since retiring in 2020, Jerry has worked as a freelance agricultural scientist, helping farmers improve production while protecting soil, water, and air. He studies how water, carbon, and gas exchange interact in the soil, using CO2 flux measurements and instruments built to measure CO2 inside crop canopies. He uses a "four R's" framework for water management: retain, redistribute, reduce, and remove.
In this episode, John and Jerry discuss:
Why water is the first thing to change as you build soil health, before carbon and then nutrients.
How bare soil can lose three-quarters of a one-inch rain to evaporation, and each tillage pass can cost another half inch.
Why raising organic matter from 2% to 4% stretches available water in a five-foot profile from 5 days to 13 days in August.
How hidden drought stress can cost 30 to 40 bushels on a 250-bushel corn crop without the leaves ever curling.
How one pass with a disc on wet soil created a shear pan that cost a farmer 150 bushels per acre.
Why tractors are getting about 900 pounds heavier each year, and compaction from a combine can still be measured 15 years later.
Why roughly half the carbon a crop captures can go into the soil as root exudates to feed soil biology.
Additional Resources
To read articles by Jerry on soil health and water management, please visit: https://greencover.com/author/dr-jerry-l-hatfield
To learn more about Jerry's work with the Soil and Water Conservation Society, please visit: https://swcs.org/about-us/our-people/board-of-directors/jerry-hatfield
To listen to Jerry's first conversation with John, please visit: https://advancingecoag.com/podcast/jerry-hatfield-on-why-should-we-care-about-soil-health/
To listen to The Carbon Capture Business with Jerry Hatfield, please visit: https://advancingecoag.com/podcast/the-carbon-capture-business-with-jerry-hatfield/
Learn more about AEA's regenerative programs and products: https://www.advancingecoag.com
About John Kempf
John Kempf is the founder of Advancing Eco Agriculture (AEA). A top expert in biological and regenerative farming, John founded AEA in 2006 to help fellow farmers by providing the education, tools, and strategies that will have a global effect on the food supply and those who grow it.
Through intense study and the knowledge gleaned from many industry leaders, John is building a comprehensive systems-based approach to plant nutrition – a system solidly based on the sciences of plant physiology, mineral nutrition, and soil microbiology.
Support For This Show & Helping You Grow
Since 2006, AEA has been on a mission to help growers become more resilient, efficient, and profitable with regenerative agriculture. AEA works directly with growers to apply its unique line of liquid mineral crop nutrition products and biological inoculants. Informed by cutting-edge plant and soil data-gathering techniques, AEA's science-based programs empower farm operations to meet the crop quality markers that matter the most.
AEA has created real and lasting change on millions of acres with its products and data-driven services by working hand-in-hand with growers to produce healthier soil, stronger crops, and higher profits.
Beyond working on the ground with growers, AEA leads in regenerative agriculture media and education, producing and distributing the popular and highly-regarded Regenerative Agriculture Podcast, inspiring webinars, and other educational content that serve as go-to resources for growers worldwide.
Learn more about AEA's regenerative programs and products: https://www.advancingecoag.com
Disclaimer: The views and opinions expressed by speakers on the Regenerative Agriculture Podcast are their own and do not necessarily reflect the views, positions, or policies of Advancing Eco Agriculture (AEA) or its employees. Appearances do not constitute an endorsement by AEA, and AEA does not guarantee the accuracy or completeness of statements made by speakers. This podcast is for educational and informational purposes only and is not a substitute for professional agronomic, medical, legal, or financial advice. Always follow product labels and applicable laws, and consult a qualified professional before making decisions for your operation or your health.

Chuck Benbrook is an agricultural economist with a PhD in agricultural economics who has also farmed commercially. From 1979 to 1997 he worked on agricultural policy in Washington, D.C., including as executive director of the National Academy of Sciences' Board on Agriculture and of a House Agriculture subcommittee. He has spent more than 40 years researching farming systems, pest management, and pesticide regulation.
For the past 25 years, Chuck has served as an expert witness in pesticide litigation involving glyphosate, chlorpyrifos, and paraquat. His 2025 paper proposes that glyphosate can persist in human bone. He is involved with the Heartland Health Research Alliance, which is running a Midwest birth cohort study on herbicide exposure.
In this episode, John and Chuck discuss:
Why weed control in 1996 often took three to five herbicides, and how Roundup Ready crops replaced that with one pass.
How glyphosate use grew about 20-fold, reaching 80% of U.S. row crop acres at its peak.
Why the first glyphosate-resistant marestail in 2004 started farmers on the herbicide treadmill.
How seed and pesticide costs for corn, soybean, and cotton farmers have roughly tripled since 1996.
Chuck's hypothesis that glyphosate binds to calcium and is stored in bone, then slowly released back into the blood.
How Don Huber's work on glyphosate tying up minerals in soybeans helped Chuck connect the dots.
Why pre-harvest desiccation is only 2-3% of glyphosate use but may drive about 90% of dietary exposure.
How John uses boron as a maturity enhancer to replace a chemical desiccant and improve grain quality.
Why Chuck believes current EPA toxicity testing misses chronic health effects, and what he would change.
Additional Resources
To read Chuck's paper on glyphosate persistence in bone, please visit: https://link.springer.com/article/10.1186/s12302-025-01057-1
To read Chuck's widely cited paper on trends in glyphosate use, please visit: https://link.springer.com/article/10.1186/s12302-016-0070-0
To read Chuck's widely cited paper on how genetically engineered crops changed pesticide use, please visit: https://link.springer.com/article/10.1186/2190-4715-24-24
To learn more about the Heartland Health Research Alliance, please visit: https://hh-ra.org
To read about the Heartland Study, a Midwest birth cohort study on herbicide exposure, please visit: https://bmcpublichealth.biomedcentral.com/articles/10.1186/s12889-023-17171-9
To listen to John's conversation with Don Huber, please visit: https://advancingecoag.com/podcast/season-2-kickoff-with-don-huber/
Disclaimer: The views and opinions expressed by speakers on the Regenerative Agriculture Podcast are their own and do not necessarily reflect the views, positions, or policies of Advancing Eco Agriculture (AEA) or its employees. Appearances do not constitute an endorsement by AEA, and AEA does not guarantee the accuracy or completeness of statements made by guests. This podcast is for educational and informational purposes only and is not a substitute for professional agronomic, medical, legal, or financial advice. Always follow product labels and applicable laws, and consult a qualified professional before making decisions for your operation or your health.
About John Kempf
John Kempf is the founder of Advancing Eco Agriculture (AEA). A top expert in biological and regenerative farming, John founded AEA in 2006 to help fellow farmers by providing the education, tools, and strategies that will have a global effect on the food supply and those who grow it.
Through intense study and the knowledge gleaned from many industry leaders, John is building a comprehensive systems-based approach to plant nutrition – a system solidly based on the sciences of plant physiology, mineral nutrition, and soil microbiology.
Support For This Show & Helping You Grow
Since 2006, AEA has been on a mission to help growers become more resilient, efficient, and profitable with regenerative agriculture. AEA works directly with growers to apply its unique line of liquid mineral crop nutrition products and biological inoculants. Informed by cutting-edge plant and soil data-gathering techniques, AEA's science-based programs empower farm operations to meet the crop quality markers that matter the most.
AEA has created real and lasting change on millions of acres with its products and data-driven services by working hand-in-hand with growers to produce healthier soil, stronger crops, and higher profits.
Beyond working on the ground with growers, AEA leads in regenerative agriculture media and education, producing and distributing the popular and highly-regarded Regenerative Agriculture Podcast, inspiring webinars, and other educational content that serve as go-to resources for growers worldwide.
Learn more about AEA's regenerative programs and products: https://www.advancingecoag.com

In this episode, commercial indoor producer Kirk Mersil shares his journey managing a 10,000-square-foot controlled-environment facility through an unexpected crop health crisis. Facing harvest losses exceeding 50% due to extreme plant brittleness and severe quality collapse, Kirk resisted conventional advice to destroy the operation and instead partnered with researcher and consultant Heber Hall to diagnose the root physiological drivers behind the outbreak.
Drawing on plant pathology and biochemistry, Heber explains that Fusarium is not inherently an aggressive pathogen, but rather a ubiquitous fungal endophyte capable of conferring disease protection and facilitating nutrient reduction in healthy crops. By shifting away from pathogen eradication toward terrain management, their collaboration demonstrates how regulating fertility inputs, sustaining photosynthetic sugar supply, and preventing oxidative cascades can downregulate pathogenic gene expression and restore resilient crop health.
In this episode, some of the topics discussed are:
How Fusarium naturally functions as a beneficial endophyte in most plants and only turns pathogenic under specific environmental or nutritional stress.

The hierarchy of fungal food preferences, shifting from plant sugars to nitrates and oxidized minerals as plant energy declines.

Critical nitrate thresholds, including how levels above 120 parts per million activate pathogenic genes and drops below 40 parts per million cause sudden wilt.

Utilizing foliar sprays of reduced trace minerals to bypass stem blockages and restore vital antioxidant enzymes.

The vital role of soluble calcium and calcium signaling in fortifying internal plant defenses against fungal disease.

How fungal quorum sensing coordinates communication to transform localized infection into systemic crop virulence.

Preemptive applications of molasses and calcium prior to heavy rains to buffer root zones against stress-induced disease triggers.

Additional Resources 
Click here to order Heber's book, Understanding Fusarium In Non-Field High Density And Contained Media Cropping
Click here to order James' book, Microbial Endophytes
Click here to order John Ott's book, Health and Light
To lern more about Heber's work, please visit: mycogasm.bio
About John Kempf
John Kempf is the founder of Advancing Eco Agriculture (AEA). A top expert in biological and regenerative farming, John founded AEA in 2006 to help fellow farmers by providing the education, tools, and strategies that will have a global effect on the food supply and those who grow it.
Through intense study and the knowledge gleaned from many industry leaders, John is building a comprehensive systems-based approach to plant nutrition – a system solidly based on the sciences of plant physiology, mineral nutrition, and soil microbiology.
Support For This Show & Helping You Grow
Since 2006, AEA has been on a mission to help growers become more resilient, efficient, and profitable with regenerative agriculture. AEA works directly with growers to apply its unique line of liquid mineral crop nutrition products and biological inoculants. Informed by cutting-edge plant and soil data-gathering techniques, AEA's science-based programs empower farm operations to meet the crop quality markers that matter the most.
AEA has created real and lasting change on millions of acres with its products and data-driven services by working hand-in-hand with growers to produce healthier soil, stronger crops, and higher profits.
Beyond working on the ground with growers, AEA leads in regenerative agriculture media and education, producing and distributing the popular and highly-regarded Regenerative Agriculture Podcast, inspiring webinars, and other educational content that serve as go-to resources for growers worldwide.

Lloyd Murdock grew up in Oklahoma, earned his PhD in soils at Virginia Tech, and found his way to the University of Kentucky while stationed at nearby Fort Knox. He has spent more than four decades there as Extension Soils Specialist, and is now Professor Emeritus at the UK Research and Education Center in Princeton, Kentucky.
Lloyd helped make no-till wheat standard practice in Kentucky. He also contributed research behind the soil penetrometer and developed an algorithm for variable-rate nitrogen in wheat. For the past decade or more, he has focused on breaking down fragipan soils with annual ryegrass. He still consults with farmers.
In this episode, John and Lloyd discuss:
Why fragipans leave many eastern U.S. crops growing on just two feet of soil above a concrete-like layer.
How annual ryegrass roots break down the fragipan at 3/4 of an inch to 2 1/2 inches per year.
A farmer who broke through more than a foot of fragipan with only four ryegrass crops in seven years.
How most roots stall above 300 psi of soil resistance, and why annual ryegrass can push through.
Why subsoiling only pays when more than 30% of a field has significant compaction.
How Kentucky's state average wheat yield climbed from the 40s to 70 bushels by doing small things right.
Why many farmers fear annual ryegrass, and how drones make fall seeding into standing crops easier.
How chlorophyll sensors and a high-nitrogen reference strip help fine-tune wheat nitrogen rates.
Additional Resources
To read the University of Kentucky's guide to fragipan remediation with annual ryegrass, please visit: https://publications.mgcafe.uky.edu/agr-250
To learn more about Lloyd's fragipan research, please visit: https://news.mgcafe.uky.edu/article/researchers-believe-fragipan-breakthrough-horizon
To read about Dave Fischer's annual ryegrass system at Fischer Farms, please visit: https://www.agproud.com/articles/46700-beef-on-rye-at-fischer-farms
Learn more about AEA: https://www.advancingecoag.com
About John Kempf
John Kempf is the founder of Advancing Eco Agriculture (AEA). A top expert in biological and regenerative farming, John founded AEA in 2006 to help fellow farmers by providing the education, tools, and strategies that will have a global effect on the food supply and those who grow it.
Through intense study and the knowledge gleaned from many industry leaders, John is building a comprehensive systems-based approach to plant nutrition – a system solidly based on the sciences of plant physiology, mineral nutrition, and soil microbiology.
Support For This Show & Helping You Grow
Since 2006, AEA has been on a mission to help growers become more resilient, efficient, and profitable with regenerative agriculture. AEA works directly with growers to apply its unique line of liquid mineral crop nutrition products and biological inoculants. Informed by cutting-edge plant and soil data-gathering techniques, AEA's science-based programs empower farm operations to meet the crop quality markers that matter the most.
AEA has created real and lasting change on millions of acres with its products and data-driven services by working hand-in-hand with growers to produce healthier soil, stronger crops, and higher profits.
Beyond working on the ground with growers, AEA leads in regenerative agriculture media and education, producing and distributing the popular and highly-regarded Regenerative Agriculture Podcast, inspiring webinars, and other educational content that serve as go-to resources for growers worldwide.
Learn more about AEA's regenerative programs and products: https://www.advancingecoag.com

Jeff Kleypas is Distribution Manager and Senior Agronomist at Advancing Eco Agriculture, based in South Texas. He began his career 20 years ago as a crop consultant walking South Texas vegetable fields that were sprayed weekly with insecticides and fungicides. He started working with biologicals in 2009 and joined AEA four years ago. He also runs a 1.5-acre market farm at home, where he tests new tools himself.
Jeff works with row crop growers and dealers across the Midwest and South, many of them now in year three or four of a full AEA program. This season he helped calibrate the CropTix sap sensor on cotton and corn and ran live demos at Midwest grower events. He uses FieldLark and other AI tools to turn sap, soil, and imagery data into faster recommendations.
In this episode, John and Jeff discuss:
A 3,000-acre Illinois corn farm that saw 5% of the tar spot with Pinion compared to its conventional fungicide check.
How cutting P and K too hard led to tip back in Illinois corn.
How the Croptix sensor returns full sap results in minutes.
A grower with a 58-bushel soybean break-even who is averaging over 80, with some spots near 100.
Pinion results from Jeff's own cut flowers, including a full month without disease.
Why AI should make farmers better at seeing patterns in data, not replace them.
Why sugars give a much bigger response at much lower rates in biologically active soils.
A biological in-furrow program that beat a 2x2 of 40 units of nitrogen by 25 bushels.
Additional Resources
To learn more about FieldLark, please visit: https://fieldlark.ai
To learn more about Pinion, please visit: https://advancingecoag.com/product/pinion/
To learn more about Croptix, please visit: https://www.croptix.ag/
To listen to Jeff's earlier podcast short, please visit: https://advancingecoag.com/podcast/podcast-short-10-breaking-away-from-traditional-agronomy-with-jeff-kleypas/
Learn more about AEA's regenerative programs and products: https://www.advancingecoag.com
About John Kempf
John Kempf is the founder of Advancing Eco Agriculture (AEA). A top expert in biological and regenerative farming, John founded AEA in 2006 to help fellow farmers by providing the education, tools, and strategies that will have a global effect on the food supply and those who grow it.
Through intense study and the knowledge gleaned from many industry leaders, John is building a comprehensive systems-based approach to plant nutrition – a system solidly based on the sciences of plant physiology, mineral nutrition, and soil microbiology.
Support For This Show & Helping You Grow
Since 2006, AEA has been on a mission to help growers become more resilient, efficient, and profitable with regenerative agriculture. AEA works directly with growers to apply its unique line of liquid mineral crop nutrition products and biological inoculants. Informed by cutting-edge plant and soil data-gathering techniques, AEA's science-based programs empower farm operations to meet the crop quality markers that matter the most.
AEA has created real and lasting change on millions of acres with its products and data-driven services by working hand-in-hand with growers to produce healthier soil, stronger crops, and higher profits.
Beyond working on the ground with growers, AEA leads in regenerative agriculture media and education, producing and distributing the popular and highly-regarded Regenerative Agriculture Podcast, inspiring webinars, and other educational content that serve as go-to resources for growers worldwide.
Learn more about AEA's regenerative programs and products: https://www.advancingecoag.com