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PODCAST

Turfgrass Epistemology

This podcast explores how we know what we know about turfgrass science. If you are a lawn care operator, sport field manager, sod producer, golf superintendent, or a home owner, this podcast provides evidence-based information to help you better manage your turfgrass.

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All Episodes

79:14

S3 E48 How to Water When Drought is Coming + Tinfoil...

Turfgrass Epistemology ·

2025/09/09

In this video, I review the scientific article “Irrigation Frequency Affects Zoysiagrass Rooting and Plant Water Status.” We’ll look at how different irrigation schedules influenced root development and water relations in zoysiagrass, and what these findings mean for turfgrass management. If you’ve ever wondered how often you should water to encourage deeper roots and better turf performance, this study offers valuable evidence-based insights.Article:

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88:34

S3 E47 Tinfoil Turfgrass: The Liquid Aeration Con in...

Turfgrass Epistemology ·

2025/09/04

In this episode, I break down the claims made in “Check out These Roots, John Perry! | [LIVE PODCAST] Ep.8 of the Average Joe Lawn Care Show,” where the hosts argue that liquid aeration is an effective solution for lawn health. I dive into the science and present evidence that challenges their assertions. With years of turfgrass science experience, I explain why liquid aeration doesn’t deliver the promised results and why relying on this product could lead to misguided lawn care practices. Don’t

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106:39

S3 E46 Two-Year Anniversary and Research Fund Raiser!

Turfgrass Epistemology ·

2025/08/28

In this video, I take a look at some of the recent comments and questions from TikTok and YouTube. Your feedback not only shapes the conversations we’re having here but also sparks deeper discussions about turfgrass science and management.I’m also excited to introduce a new fundraiser supporting turfgrass research. Turfgrass plays a vital role in sports, recreation, and landscapes, yet research in this area often goes underfunded. Your support will help advance studies that improve sustainability,

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58:24

S3 E45 Tall Fescue Rooting and Deficit Irrigation

Turfgrass Epistemology ·

2025/08/26

In this video, I explore the findings of the research article “Tall Fescue Rooting as Affected by Deficit Irrigation” (HortScience, Volume 42, Issue 3). The study, conducted by Jinmin Fu, Jack Fry, and Bingru Huang and published June 1, 2007, investigates how reduced irrigation impacts the rooting behavior of 'Falcon II' tall fescue grasses using minirhizotron imaging.I’ll walk through: The study’s experimental setup using varying levels of evapotranspiration (20%, 60%, and 100%) Key findings such

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01:05:39

S3 E44 Frequent Irrigation Increases Turf Quality and...

Turfgrass Epistemology ·

2025/08/21

In this video, I examine the research by Cain et al. (2022) that explores how varying irrigation schedules affect the encroachment of annual bluegrass (Poa annua) into perennial ryegrass turf systems in western Oregon. The study reveals that watering once per week significantly reduces annual bluegrass encroachment compared to irrigating four times a week, and that replacing irrigation volumes based on reference evapotranspiration (ETref) had no meaningful impact on that outcomeThroughout the

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01:30:09

S3 E43 Irrigation Affects Fescue Color and Weeds

Turfgrass Epistemology ·

2025/08/07

In this video, I discuss the scientific article "Irrigation Rates and Frequency Affect Tall Fescue Color and Weed Encroachment." We’ll examine how adjusting irrigation amounts and timing influences turfgrass aesthetics and weed pressure. From water conservation to maintaining turf quality, this study provides valuable guidance for anyone managing tall fescue under variable moisture conditions.https://onlinelibrary.wiley.com/doi/full/10.1002/its2.184 📩 Have a comment or question of your own? Drop

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01:06:09

S3 E42 Does Irrigation Influence Root Extension?

Turfgrass Epistemology ·

2025/08/05

In this video, I review the scientific article "Irrigation Frequency and Amount Effect on Root Extension during Sod Establishment of Warm-season Grasses." We’ll explore how different irrigation strategies influence root growth during establishment, what this means for practical turfgrass management, and how to strike the right balance between watering efficiency and sod performance. If you manage turf or are curious about water-wise establishment practices, this study offers some important

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01:07:29

S3 E40 Kentucky Bluegrass, Water Use, and Soil Texture

Turfgrass Epistemology ·

2025/07/29

In this video, I offer commentary on the scientific article titled "Water use and performance of Kentucky bluegrass influenced by cultivar, irrigation practices, and soil texture," published in the International Turfgrass Society Research Journal (DOI: 10.1002/its2.200).The study evaluated two Kentucky bluegrass cultivars, Mallard and Geronimo, grown in lysimeters filled with either loamy sand or silt loam. Each setup was subjected to two irrigation levels: 40% and 80% replacement of reference

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01:12:44

S3 E40 Exploring Irrigation Strategies for Tall Fescue

Turfgrass Epistemology ·

2025/07/24

In this video, I dive into the 2002 study from Crop Science that evaluates how different irrigation schedules, tall fescue cultivars, and mowing heights interact to shape turf performance.Article: https://acsess.onlinelibrary.wiley.com/doi/full/10.2135/cropsci2002.2011 ✅ What you'll discover: Study design highlights: 2‑year field trial in Riverside, CA, comparing 2–4 irrigation events per week at ~80 % ET₀, two cultivars (a dwarf vs. a turf-type), and two mowing heights (~3.8 cm vs. 6.4 cm) Key

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01:04:44

S3 E39 Tinfoil Turfgrass: Whole Lot of Potassium =...

Turfgrass Epistemology ·

2025/07/22

In this video, I respond to the Bermuda Grass Central video “The Best Summer Fertilizer for Lawns? Why Yard Mastery 7‑0‑20 is …”. I break down their main arguments, evaluate their fertilizer recommendations, and highlight both strong and weak points.✅ What you’ll get: Summary of Claims: A quick overview of the video’s main points—why the creator supports Yard Mastery’s 7‑0‑20 blend for summer turf. Critical Analysis: Comparing their claims to current turf fertilization research—does a

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01:46:44

S3 E38 Tinfoil Turfgrass: More Granular and Foliar...

Turfgrass Epistemology ·

2025/07/17

In this video, I critique “Found the Best Iron to Apply to Your Lawn For Summer Color” by a former golf course superintendent. While I agree that iron can boost turf color without pushing growth, I question some of the application advice—especially the dosing schedule and lack of soil pH context.I break down what the original video gets right, what it misses, and share my evidence-based tips for using iron effectively this summer. If you want deep green turf without wasting money or product, this

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01:10:14

S3 E37 Perennial Ryegrass Irrigation Rates and...

Turfgrass Epistemology ·

2025/07/16

In this video, I break down the findings from the scientific article "Optimizing Irrigation Rates and Frequency for Perennial Ryegrass in Western Oregon." We’ll look at how different irrigation strategies affected turf quality and what this means for managing ryegrass under Pacific Northwest conditions. Whether you’re a turf manager or a lawn care enthusiast, this research has practical takeaways you can use. 🔔 Subscribe to Turfgrass Epistemology for more turf science and myth-busting

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01:25:09

S3 E36 Dr. Dan Sandor - Irrigation Requirements...

Turfgrass Epistemology ·

2025/07/03

On this episode of Turfgrass Epistemology, Dr. Dan Sandor joins me to break down his study that addresses one of the most commonly misunderstood aspects of turf establishment: how much water should you really apply when seeding a new lawn?Sandor et al. (2021) evaluated daily irrigation at 50%, 75%, 100%, and 125% reference evapotranspiration (ETo) to determine how quickly tall fescue and bermudagrass cultivars reach full coverage. The big takeaway? Applying more than 100% didn’t help, and

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53:29

S3 E35 Which Turfgrass Uses the Least Water?...

Turfgrass Epistemology ·

2025/06/24

In this episode of Turfgrass Epistemology, we dive into a study from Oregon State University that looked at how turfgrass species and mowing height affect water requirements in western Oregon. The results might surprise you—tall fescue and perennial ryegrass significantly outperformed fine fescues when it came to conserving water.We’ll break down the data on evapotranspiration replacement, irrigation intervals, and how mowing height can influence your watering schedule. Should you mow higher

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01:37:09

S3 E34 Comments and Emails. June 2025. Part 2.

Turfgrass Epistemology ·

2025/06/20

In this episode, I dive into the comment section and my inbox to respond to the most interesting, insightful, and downright puzzling messages I’ve received from viewers. From soil test questions and fertilizer theories to passionate turf debates and a few questionable product claims—nothing is off limits.Whether you're here to learn, laugh, or just see if your message made the cut, this video is a behind-the-scenes look at the community that makes Turfgrass Epistemology what it is. Let’s talk turf,

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01:05:29

S3 E33 Comments and Emails. June 2025. Part 1.

Turfgrass Epistemology ·

2025/06/17

In this episode, I dive into the comment section and my inbox to respond to the most interesting, insightful, and downright puzzling messages I’ve received from viewers. From soil test questions and fertilizer theories to passionate turf debates and a few questionable product claims—nothing is off limits.Whether you're here to learn, laugh, or just see if your message made the cut, this video is a behind-the-scenes look at the community that makes Turfgrass Epistemology what it is. Let’s talk turf,

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01:41:44

S3 E32 Tinfoil Turfgrass: Debunking Summer Lawn Care...

Turfgrass Epistemology ·

2025/06/12

In this video, I critically examine the advice presented in "How to Fertilize in Hot Weather. Dog urine spot prevention, fungus recovery, general fertilizer." While the original video offers practical tips on lawn care during hot weather, it's essential to scrutinize the recommendations to ensure they align with best practices and scientific understanding.Key Points Discussed: - Fertilizing in High Temperatures: Assessing the risks and benefits of applying fertilizer during peak heat and its impact

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59:04

Drought Testing. Which Grass Uses the Least Water?

Turfgrass Epistemology ·

2025/06/10

In this episode of Turfgrass Epistemology, we analyze a pivotal field study that tested the drought resistance and irrigation needs of five common turfgrass species under real-world conditions in northern Texas. Using a unique linear gradient irrigation system, Qian and Engelke evaluated how ‘Tifway’ bermudagrass, ‘Meyer’ zoysiagrass, ‘Rebel II’ tall fescue, ‘Prairie’ buffalograss, and ‘Nortam’ St. Augustinegrass performed under a wide range of watering regimes—from excess irrigation to complete

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01:24:12

S3 E30 Tinfoil Turfgrass: University Study Misused?...

Turfgrass Epistemology ·

2025/06/05

He flashes university research to sell Air 8—but is it the whole story? In this video, I break down the science he didn’t show you. Liquid aeration sounds impressive, but does the data actually support the hype? Let’s dig into what the university study really says—and what he conveniently left out. If you're serious about turfgrass and tired of marketing spin dressed up as science, this one's for you.Join Turfgrass Epistemology to get access to

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01:01:29

S3 E29 Which Grass Survives Water Restrictions?

Turfgrass Epistemology ·

2025/06/04

Which Grass Survives Water Restrictions? Science Has the Answer.On this episode of Turfgrass Epistemology, we dive into a long-term study that puts warm-season turfgrasses to the test under real-world municipal water restrictions. Which species held up best when irrigation was limited to once or twice a week? How do turf quality, coverage, and drought resilience stack up over time? Join me as we examine what the science actually says—not the marketing claims—about how Zoysia, Bermuda, and other

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