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.
S3 E35 Which Turfgrass Uses the Least Water? Surprising Results from Oregon Research
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? Should you convert to tall fescue? This video gives you practical, science-backed guidance on how to choose and manage turfgrasses for water conservation.
<...S3 E34 Comments and Emails. June 2025. Part 2.
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, tackle misinformation, and maybe share a few facepalms along the way.
...
S3 E33 Comments and Emails. June 2025. Part 1.
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, tackle misinformation, and maybe share a few facepalms along the way.
...
S3 E32 Tinfoil Turfgrass: Debunking Summer Lawn Care Myths
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 on lawn health.
- Dog Urine Spot Prevention: Evaluating the suggested methods for preventing and treating urine spots caused by...
S3 E31 Drought Testing. Which Grass Uses the Least Water?
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 reliance on rainfall.
What did they find? Not all turfgrasses respond the same way to drought—or to overwatering. Some thrived under low water input, while others demanded more than expec...
S3 E30 Tinfoil Turfgrass: University Study Misused? The Truth About Liquid Aeration.
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.
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S3 E29 Which Grass Survives Water Restrictions?
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 species perform under regulated irrigation frequencies. This research has big implications for homeowners, sports fields, golf cour...
S3 E28 Is Liquid Aeration a Scam?
You've seen the ads: "Liquid aeration breaks up soil compaction—no plugs, no mess!" But does it really work? This video dives into a new peer-reviewed study that compares liquid aeration products (humic acids, seaweed, fertilizer blends) with mechanical hollow-tine cultivation on hybrid bermudagrass fairways.
The results are eye-opening.
✅ Did liquid aeration improve turf health?
✅ Can it reduce compaction like traditional aerification?
✅ What really increases water infiltration and rooting?
Whether you're a turf manager, lawn care professional, or homeowner chasing the perfect lawn—this evidence-based review will help you separate marketing hype from...
S3 E27 Tinfoil Turfgrass - How to Apply Iron from Someone Who Knows Nothing About Iron.
Is "fast green" always the right goal? In this episode, I critique the video [How to Get a GREEN LAWN FAST] and unpack the science behind the three quick tips it promotes. Are these practices sustainable—or just shortcuts with hidden consequences? Join me as we separate turfgrass fact from flashy fiction.
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S3 E26 Tall Fescue Response to Irrigation Intervals
Discover how tall and hard fescue respond to water stress in this deep dive into the science of deficit irrigation. In this episode, we explore a peer-reviewed study that reveals how reduced water inputs affect turf performance, rooting, and drought resilience. If you're managing turf in a water-limited environment, this research has critical insights you don't want to miss.
article: https://acsess.onlinelibrary.wiley.com/doi/abs/10.2135/cropsci1989.0011183X002900060045x
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S3 E25 Irrigation Frequency on Bentgrass Rooting
In this episode of Turfgrass Epistemology, I provide commentary on the scientific article "Effect of Irrigation Frequency on Turf Quality, Shoot Density, and Root Length Density of Five Bentgrass Cultivars." We examine how irrigation intervals influence turfgrass performance, with a focus on shoot density and root development. I discuss the experimental design, key findings, and what this research means for managing bentgrass under varying irrigation regimes. If you're interested in evidence-based turf management, this one's for you.
Article: https://acsess.onlinelibrary.wiley.com/doi/abs/10.2135/cropsci2003.2820
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S3 E24 Irrigation Frequency on Zoysiagrass Rooting
In this episode of Turfgrass Epistemology, I provide commentary on the scientific article "Irrigation frequency effects on Prizm zoysiagrass establishment from sprigs." We examine how different irrigation intervals influenced establishment speed, coverage, and quality during early growth. I break down the study’s design, highlight the key findings, and discuss how the results apply to real-world turf management decisions—especially for professionals establishing zoysiagrass from sprigs.
article: https://acsess.onlinelibrary.wiley.com/doi/10.1002/agg2.70000
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S3 E23 AI Answers Every Turf Question. But Is It Correct?
In this episode of Turfgrass Epistemology, we put artificial intelligence to the test by asking it turfgrass management questions—fertility, irrigation, mowing, and more. Can AI provide sound, evidence-based answers, or does it fall into common misconceptions? As a soil scientist, I evaluate its responses and reveal what the science actually says.
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S3 E22 St. Augustinegrass Response to Irrigation Scheduling
In this episode of Turfgrass Epistemology, I review the scientific article "Physiological Response of St. Augustinegrass to Irrigation Scheduling." We explore how different irrigation strategies impact turf health, drought stress, and water use efficiency. As a soil scientist, I break down the study’s methods and findings to understand what truly benefits St. Augustinegrass under varying moisture conditions.
article: https://acsess.onlinelibrary.wiley.com/doi/abs/10.2134/agronj1984.00021962007600020024x
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S3 E21 Dr. Matteo Serena - Optimizing Irrigation Frequency Needed to Establish Cool-Season Turfgrasses
In this episode of Turfgrass Epistemology, I sit down with Dr. Matteo Serena to discuss his paper, "Optimizing Frequency and Amount of Irrigation Needed to Establish Cool-Season Turfgrasses." We explore the key findings, practical applications, and how this research can improve turfgrass establishment strategies. Join us for a deep dive into the science behind efficient irrigation and better turf management.
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S3 E20 Comments and Emails. April 2025.
On this episode of Turfgrass Epistemology, I discuss some of the recent comments, emails, and Twitter conversations related to turfgrass science. From thoughtful questions to common misconceptions, I highlight the importance of critical thinking and scientific evidence when evaluating turf management practices. Join me as we explore how public discussions shape what we know—and how we can sharpen our understanding of turfgrass through better communication.
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S3 E19 Water Movement In Soils
Join me, a soil scientist, as I delve into the classic educational film "Water Movement In Soils" (https://youtu.be/DmTNFIEc2VA). This video, produced by Washington State University in 1959, provides a foundational understanding of how water moves through different soil types, highlighting the roles of soil texture, structure, and layering.
YouTube
In my commentary, I explore key concepts such as capillary action, infiltration, and percolation, and discuss how these processes affect soil health and plant growth. I also examine the implications for modern soil management practices, including irrigation strategies and soil amendment techniques.
Whet...
S3 E18 Do Irrigation Intervals Affect Turfgrass Rooting?
In this video, we delve into the 1985 study by Peacock and Dudeck, titled "Effect of Irrigation Interval on St. Augustinegrass Rooting," published in the Agronomy Journal. The research examines how varying irrigation intervals—every 2, 3, 4, or 6 days—impact the root mass and length density of St. Augustinegrass. Interestingly, the study found that root development remained unaffected across these intervals, suggesting that less frequent irrigation may not compromise root growth. These findings have significant implications for turfgrass irrigation practices, potentially leading to more efficient water usage without sacrificing turf quality.
Read the full article here: https://doi.org/10.2134/agronj1985.00021962007700050034x
...S3 E17 Soil CO2 Tests for Bentgrass Putting Greens.
In this video, I break down the science behind the article “Short-term soil carbon mineralization on golf course sand-based putting green and its effect on creeping bentgrass nitrogen uptake.” What does this research tell us about nitrogen cycling, microbial activity, and nutrient availability in high-performance turf systems? Let’s dive into the data and talk implications for turfgrass management.
📢 Watch, learn, and share your thoughts in the comments!
Zhou, Q., Soldat, D. J., & Ruark, M. D. (2024). Short-term soil carbon mineralization on golf course sand-based putting green and its effect on creeping bentgrass nitrogen uptake. Crop Science, 6...
S3 E16 Not Really Tinfoil Turfgrass #5. Particle Size of Urea & Ammonium Sulfate.
As a soil scientist, I’m breaking down the claims made in the video “Stop Overseeding! There’s a Cheaper Way!!” — let’s talk turfgrass science, soil fertility, and whether the advice holds up under scrutiny. Is there really a better, cheaper alternative to overseeding? Let’s find out.
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S3 E15 Tinfoil Turfgrass #4: Fastest Way to Get Your Money!
Does the FASTEST Way To Get ANY Lawn Green actually work, or is it just another lawn care myth? As a soil scientist, I break down the claims, analyze the science behind turfgrass nutrition, and reveal what REALLY makes a lawn green—fast and sustainably.
🌱 Is this method safe and effective?
⚠️ Are there hidden downsides?
🔬 Let’s separate fact from fiction using real soil science!
📢 Watch, learn, and share your thoughts in the comments!
#LawnCare #SoilScience #TurfgrassManagement #GreenGrass #FertilizerFacts
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S3 E14 Solvita Soil Test.
How can Solvita soil tests help predict turfgrass response? In this video, we break down key findings from the scientific article "Predicting Cool-Season Turfgrass Response with Solvita Soil Tests, Part 1: Labile Amino-Nitrogen Concentrations." Learn how labile amino-nitrogen measurements can provide insights into soil fertility and turfgrass nutrition, potentially improving nutrient management strategies.
📄 Read the full study: https://doi.org/10.2135/cropsci2018.11.0706
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#TurfgrassScience #SoilTesting #GolfCourseManagement #TurfNutrition
Moore, D.B., Guillard, K., Geng, X., Morris, T.F. and Brinton, W.F. (2019), Predicting Cool-Season Turfgrass Response with Solvita Soil Tests, Part 1...
S3 E13 Comments, Emails, Twitter, and Soil Reports
In this video, I dive into the fascinating world of turfgrass epistemology by analyzing emails, comments, Twitter discussions, and soil reports. How do these sources shape our understanding of turf science? What insights (or misinformation) can we uncover? Join me as we explore the intersection of communication, scientific reports, and the ever-evolving landscape of turfgrass knowledge.
📩 Drop your thoughts in the comments!
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S3 E12 Does Mulching Leaves Reduce Dandelions?
In this video, I review the scientific article "Mulched Maple and Oak Leaves Associated with a Reduction in Common Dandelion Populations in Established Kentucky Bluegrass." What do the findings mean for turfgrass management? How does this study fit into broader turfgrass epistemology? Join me as I break down the methodology, results, and implications for turf science.
📄 Link to the article https://journals.ashs.org/horttech/view/journals/horttech/19/2/article-p297.xml
💬 Share your thoughts in the comments!
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Kowalewski, A. R., Buhler, D. D., Lang, N. S., Nair, M. G., & Rog...
S3 E11 Will Organic Fertilizer Change Soil Properties on Sport Turf?
Discover how organic management practices can improve the sustainability and safety of athletic fields! 🌱⚽🏈 This video explores key findings from the scientific article Organic Management Practices on Athletic Fields, discussing soil health, turf quality, and environmental benefits. Learn about organic fertilizers, pest management strategies, and how these practices compare to conventional methods. Whether you're a sports field manager, turfgrass professional, or sustainability enthusiast, this video provides valuable insights into maintaining high-performance fields—naturally!
🔬📖 Read the full study: https://acsess.onlinelibrary.wiley.com/doi/abs/10.2135/cropsci2012.03.0195
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Miller, N.A. and Henderson, J...
S3 E10 Tinfoil Turfgrass #3 - The Best Cheerleader for Selling Lawn Products You Don't Need.
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S3 E9 Does Mulching Leaves Benefit Soil Health?
Can mulching leaves in place improve turf and soil health while reducing energy use? This research study explores the benefits of leaf mulching, including enhanced soil quality, reduced need for fertilizers, and even potential impacts on tick populations. Watch to learn how this simple practice can promote sustainability in lawn care!
🔬 Read the full study: https://www.tandfonline.com/doi/full/10.1080/1065657X.2024.2370854
🌱 Subscribe for more eco-friendly lawn care tips! #SustainableLandscaping #LeafMulching #SoilHealth
Bonhotal, J., & Schwarz, M. (2024). Improving Turf and Soil Health, Reducing Energy Use and Assessing Tick Populations by Mulching Leaves in Place. Compost Scienc...
S3 E8 Tinfoil Turfgrass #2 - Soil Compaction Has a New Liquid Cure!
Is liquid aeration really the solution to compacted soil, or just a scam? In this video, we break down what soil compaction is, how it affects plant growth, and why liquid aeration might not be the magic fix it claims to be.
🔹 What causes soil compaction?
🔹 Why mechanical aeration works better
🔹 The science (or lack of it) behind liquid aeration
Don’t fall for marketing gimmicks—get real solutions for healthy, breathable soil! 🌱💪 Like & subscribe for more lawn care truths. #SoilCompaction #LawnCareMyths #LiquidAerationScam
📌 Don’t forget to like, comment, and subscribe for more insights on sus...
S3 E7 Fate and Activity of Applied Soil Microorganisms & Tinfoil Turfgrass #1
Discover what happens to microorganisms when they are introduced into the soil! This video explores their survival, adaptation, and role in nutrient cycling, plant growth promotion, and soil health. Learn how factors like environmental conditions, competition, and soil properties influence microbial activity and effectiveness. 🌍✨
🔹 Microbial interactions in soil
🔹 Environmental influences on survival
🔹 Benefits for agriculture and sustainability
Don't forget to like, share, and subscribe for more insights into soil microbiology! 👍🔔 #SoilMicrobiology #Microbes #SustainableFarming
van Veen JA, van Overbeek LS, van Elsas JD. Fate and activity of microorganisms introduced into soil. Microbiol Mol Biol Rev. 1997 J...
S3 E6 Nanobubbles for Dollar Spot Suppression?
Discover the latest research on innovative turfgrass management! 🌱 This video explores the scientific article, "Evaluation of oxygenated and ozonated nanobubble water treatments for dollar spot suppression in seashore paspalum." Learn how advanced nanobubble water technology is being tested to combat dollar spot disease in seashore paspalum turfgrass. Can oxygenated and ozonated water treatments offer sustainable solutions? Watch to find out more about these groundbreaking approaches to turf health and disease management! 💧📘
📌 Don’t forget to like, comment, and subscribe for more insights on sustainable practices! 🌿
Spratling, W. T., Jespersen, D., Waltz, C., Martinez-Espinoza, A. D., & Bahri, B. A. (202...
S3 E5 Organic Management Practices on Athletic Fields
Explore the impact of organic management on athletic fields! 🌱 In this video, we dive into the study, "Organic Management Practices on Athletic Fields and the Effects on Turfgrass Color, Quality, Cover, and Weed Populations." Discover how organic practices influence turfgrass health, aesthetics, and weed control, and see how they compare to conventional methods. Whether you're a turf manager, sports field professional, or just curious about sustainable practices, this research has valuable insights for everyone. 🏟️📘
Miller, N.A. and Henderson, J.J. (2012), Organic Management Practices on Athletic Fields: Part 1. The Effects on Color, Quality, Cover, and Weed Populations. Crop Scienc...
S3 E4 How Do We Measure Soil Health?
What exactly is soil health, and why does it matter? In this video, learn how soil functions as a living, dynamic system, supporting plant growth, storing carbon, cycling nutrients, and filtering water. Discover key indicators of soil health, including organic matter, microbial activity, nutrient levels, structure, and water-holding capacity.
Join us as we explore the science and practical tools to evaluate and improve soil health for a sustainable future! 🌍
📌 Don’t forget to like, comment, and subscribe for more insights on sustainable practices! 🌿
#SoilHealth #Sustainability #HealthySoil
Stewart, R.D., Jian, J., Gyawali, A...
S3 E3 Double the Videos! Double the Bullsh?t!
This video challenges common misconceptions about soil testing for your lawn. It highlights misinformation about soil pH and boron levels, explaining how these factors are often misunderstood or misrepresented. Learn the science behind soil tests and how to interpret results accurately to improve your lawn care routine. Think you need a long list of expensive products for a healthy lawn? Think again! This video debunks claims about so-called "essential" lawn care products, helping you separate marketing hype from practical, effective lawn care strategies. Don’t fall for unnecessary expenses—watch now for expert advice!
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S3 E2 Base Saturation and Soil Health
Does base cation saturation really improve soil health? In this video, we explore the science behind base cation saturation ratios and why they may not deliver the soil health benefits often claimed. Learn how real-world data and research challenge this common misconception, and discover what truly matters for improving soil fertility and productivity. Watch now to separate myth from fact!
Chaganti VN, Culman SW, Herms C, Sprunger CD, et al., (2021). Base cation saturation ratios, soil health, and yield in organic field crops. Agronomy Journal. 2021; 113: 4190–4200. https://doi.org/10.1002/agj2.20785
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S3 E1 Organic vs. Synthetic Nitrogen Influence on Sport Turf Wear Tolerance and Soil Health
How do synthetic and organic fertilizers impact athletic turfgrass performance and soil health? In this video, we dive into research on the effects of these fertilizers on turfgrass traffic tolerance, durability, and overall soil quality. Whether you're managing sports fields or curious about sustainable practices, this breakdown will give you insights to optimize turf performance and maintain soil health. Watch now for expert analysis and tips!
Dest, W. M., & Ebdon, J. S. (2025). Sustainability of athletic field turf comparing organic and synthetic practices under two heights of cut. Crop Science, 65, e21317. https://doi.org/10.1002/csc2.21317
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S2 E120 December Comments and Emails
Join me as I dive into your comments and emails about lawns, golf courses, sod farms, and sports turfgrass! 🌱 From turf maintenance tips to the environmental impact of these green spaces, I’ll address your questions, concerns, and curiosities. Let’s talk about the science, sustainability, and care behind these grassy spaces we see every day. Don’t forget to like, comment, and subscribe for more insights!
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S2 E119 Cold Reading the Barnum Effect - Part 3
Ever wondered how psychics, fortune-tellers, and even some salespeople seem to know so much about you? In this video, we dive into the fascinating psychology behind cold reading and the Barnum Effect—techniques used to make general statements feel deeply personal.
Understanding these methods is crucial to protect yourself from being misled or manipulated by con artists, scammers, and those who exploit trust. Learn how these tricks work, why they’re so convincing, and how to spot them before you’re taken advantage of. Knowledge is power—stay informed and stay in control!
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S2 E118 Effect of Ozonated Water on Bentgrass.
Does ozonated water really boost turfgrass health? In this video, we explore the science behind ozonated water and its impact on turfgrass performance. Despite its popularity in some circles, research shows limited benefits for turf health, growth, or resilience. Learn why traditional turf management practices often outperform ozonation and how you can focus on proven methods for healthier turf!
Sloan, J. J., & Engelke, M.C. (2005). Effect of Ozonated Water on Creeping Bentgrass Growth in a Sand Medium. HortTechnology horttech, 15(1), 148-152. Retrieved Dec 15, 2024, from https://doi.org/10.21273/HORTTECH.15.1.0148
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S2 E117 Why Does Dog Urine Kill Lawns?
Dog urine can damage your lawn, but how does it? Many people claim high levels of nitrogen or salt in the urine kills the grass but you may be surprise to find these have very little influence. Learn how to prevent those unsightly brown spots and keep your grass green and healthy while caring for your furry friend! 💚🐾
#DogCare #LawnTips #PetFriendlyYards
Chang, Z., Huang, S. and Li, D. (2018), Lactic Acid is a Major Contributor to Dog Urine Injury in Cool-Season Lawn Species. Crop Science, 58: 917-924. https://doi.org/10.2135/cropsci2017.08.0487
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S2 E116 Soil Testing Ca, Mg, pH, and Micros Nonsense. Part III.
Ion exchange soil tests might seem like a modern solution for analyzing your soil, but they lack scientific backing and often provide unreliable results. In this video, we break down why these tests aren't evidence-based, how they can mislead your gardening or turfgrass management practices, and what trusted alternatives you should consider for accurate soil health insights.
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