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Turfgrass Epistemology

Science

Turfgrass Epistemology

Travis Shaddox

S4 E37 Your Brain Decided Before You Knew

July 14, 2026 7:22am 53 min

Did Benjamin Libet's famous 1983 experiment prove that your brain decides before you do? In this episode, we examine Libet, Gleason, Wright, & Pearl (1983), "Time of Conscious Intention to Act in Relation to Onset of Cer...

S4 E36 Appeal to Authority: Why Smart People Make Bad Decisions

July 09, 2026 10:03am 1:15

In this episode of Turfgrass Epistemology, we examine Stanley Milgram's classic paper, Behavioral Study of Obedience (1963), and explore how authority influences our beliefs and decisions. Why do turf managers, consultan...

S4 E35 Why We Believe Things That Aren't True - Part 1

July 08, 2026 5:00am 59 min

In this episode of Turfgrass Epistemology, we examine one of the most influential scientific papers ever published: Judgment Under Uncertainty: Heuristics and Biases by Amos Tversky and Daniel Kahneman (1974). This landm...

S4 E34 Why Smart People Keep Making This Mistake

July 02, 2026 5:00am 1:17

Why do smart people search for evidence that confirms their beliefs instead of trying to prove themselves wrong? In this video, we explore Peter Wason's famous 2-4-6 experiment and the origins of confirmation bias. Paper...

S4 E33 What Astrology, Personality Tests, and Soil Tests Have in Common

June 30, 2026 6:42am 53 min

Why do generic soil reports feel surprisingly accurate? In this video, we explore the Forer Effect and discuss how vague, universally true statements can create the illusion of personalized insight—whether in personality...

S4 E32 Bandwagon Appeal and Social Pressure

June 25, 2026 5:00am 1:01

Why do people conform to group pressure even when they know the group is wrong? In this video, we explore Solomon Asch's landmark conformity study, Opinions and Social Pressure (1955), and reveal what his famous experime...

S4 E31 Dr. Jada Powlen - Summer Nitrogen on Tall Fescue?

June 23, 2026 9:22am 58 min

Does summer nitrogen really make brown patch worse in tall fescue? In this interview, Dr. Jada Powlen discusses her 2024 study and explains why cultivar selection may be more important than nitrogen rate for managing bro...

S4 E30 Does Manganese Influence Take-All Disease?

May 28, 2026 5:00am 1:11

In this video, I break down the classic study “Optimizing Manganese Fertilization for the Suppression of Take-All Patch Disease on Creeping Bentgrass.” We examine whether manganese applications can suppress take-all patc...

S4 E29 Can Silicon Reduce Turfgrass Disease?

May 07, 2026 7:19am 1:02

In this video, I break down the study “Evaluation of Calcium Silicate for Brown Patch and Dollar Spot Suppression on Turfgrasses.” We examine whether calcium silicate (Si fertilizers) actually suppress turfgrass diseases...

S4 E28 Does Biological Disease Control Work on Turfgrasses?

May 05, 2026 8:50am 59 min

In this video, I break down the research on biological and oil-based fungicides for dollar spot control in turfgrass. We examine whether products like biological fungicides, mineral oils, and plant-based treatments actua...

S4 E27 Tinfoil Turfgrass - 35 Years of Experience. 35 Years of Bullsh*t.

April 30, 2026 5:00am 1:36

In this video, I break down a lawn care discussion on nitrogen fertilizers and turfgrass performance, separating what’s scientifically sound from what may be oversimplified. We take a closer look at how nitrogen source, ...

S4 E26 Tinfoil Turfgrass - How to With Steve and BS Booster!

April 28, 2026 7:22am 1:12

In this video, I break down the “DirtBooster Organic Lawn and Garden Treatment” video from How to With Doc and take a closer look at the claims around soil microbes, biochar, humic substances, and “super compost.” The pr...

S4 E25 Tinfoil Turfgrass - More soil testing nonsense from Steve.

April 23, 2026 4:00am 1:40

In this video, I break down a popular lawn care video on soil testing, pH, and nutrient recommendations and separate what’s useful from what may be misleading. We take a closer look at how soil test results are interpret...

S4 E24 Tinfoil Turfgrass - He Thinks Aerification is the Most Important Thing for Your Lawn. 🤦‍♂️

April 21, 2026 6:38am 1:17

In this video, I break down a lawn care video making the rounds online and separate what sounds right from what’s actually supported by turfgrass science. We take a closer look at the claims, the reasoning behind them, a...

S4 E23 Comments and Emails - Why do pet spots last so long?

April 20, 2026 7:18am 1:38

In this video, I respond to comments and emails and answer a common question: Why do dog urine (pet) spots last so long in turfgrass? We break down the science behind nitrogen burn, salt injury, and recovery limitations ...

S4 E22 Elevated Lawnscapes, Turf Therapy, and Polo Fields

April 02, 2026 11:58am 1:24

In this episode, I sit down with Rob from Turf Therapy and Cam from Elevated Lawnscapes to talk all things lawn care, content creation, and turfgrass management. We discuss their approach to building great lawns, lessons...

S4 E21 Calcium vs. Limestone on Dollar Spot.

March 31, 2026 6:35am 58 min

In this video, I break down the study “Influence of Calcium and Nitrogen Fertilizer on Creeping Bentgrass Infected with Dollar Spot.” We examine whether  it is calcium or lime that actually suppresses dollar spot, how it...

S4 E20 Can Milorganite, Sea Kelp, or Manure Reduce Dollar Spot + Tinfoil Turfgrass!

March 26, 2026 4:00am 1:48

In this video, I break down the classic study “Microbial Populations and Suppression of Dollar Spot Disease in Creeping Bentgrass with Inorganic and Organic Amendments.” We take a close look at whether organic fertilizer...

S4 E19 Dr. Scott McElroy - Herbicide and Insecticide Interations

March 24, 2026 7:53am 1:01

In this episode, I interview Dr. Scott McElroy (Auburn University) about weed control in turfgrass, including best practices for herbicide timing, resistance management, and how herbicides interact with insecticides. We ...

S4 E18 Tinfoil Turfgrass - Floratine 'Master Class' of BS

March 19, 2026 4:00am 1:36

In this video, I break down a Floratine Masterclass where Tim Cartwright discusses a common claim about calcium availability in soils. I examine the argument, the science behind calcium in turfgrass soils, and whether th...

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