Turfgrass Epistemology

S3 E42 Does Irrigation Influence Root Extension?

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 insights.
https://journals.ashs.org/view/journals/hortsci/46/8/article-p1202.xml?rskey=SDm3zj&print
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Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
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Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf

S3 E41 Kentucky Bluegrass, Water Use, and Soil Texture

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 evapotranspiration. The authors monitored water use and turf coverage throughout the growing season to assess drought resilience.
My commentary covers the key findings from the research, including why Mallard outperformed Geronimo under water-limited conditions, how irrigation volume influenced turf coverage more than irrigation frequency, and why soil texture had relatively minor effects on water use. I also discuss the strengths and limitations of the study design and its relevance to real-world turfgrass management.
If you're interested in sustainable lawn care, water conservation, or evidence-based turfgrass science, this discussion is for you. Subscribe for more commentary and analysis grounded in peer-reviewed research.
👍 If you care about sustainable turfgrass care, joining the lawn‑maintenance conversation, or translating research into real‑world insights—this commentary is for you!
🔔 Subscribe for more science-based commentary—from agronomy insights to environmental sustainability.
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Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
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Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf

S3 E40 Exploring Irrigation Strategies for Tall Fescue

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 findings: Twice-weekly “deep” watering yielded the highest visual quality. Dwarf cultivars and shorter mowing height boosted turf quality early, but overwatering and mowing short favored shallow roots and weed growth  Practical takeaways for lawn and turf managers:
Go for deep, twice-weekly irrigation at ~80 % ET₀ rather than frequent shallow watering.Use dwarf cultivars with lower mowing heights—but monitor for stress and shallow rooting.Always consider local soil type and climate before applying these findings.
👍 Like, subscribe, and hit the bell for more science‑backed turf insights!💬 Have you experimented with irrigation patterns or mowing heights? Share your story below.
📩 Have a comment or question of your own? Drop it below or email me.
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Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
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Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf
Diagnostic Criteria for Turfgrass Bullshit Disorder:https://drive.google.com/file/d/1Y_GeVPQ237pzm0ImTP4eVij6I9D0PHPn/view

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

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 high-potassium, zero-nitrogen mix really benefit warm-season grasses in mid-summer? I'll cite recent studies and best management practices.
Pros and Cons: Where the video gets it right—e.g., advocating for balanced nutrition and turf health—and where it simplifies or overlooks key science, such as soil testing, nutrient ratios, and seasonal timing.
Practical Advice: My take on when and how to actually use 7‑0‑20—or not—and what lawn owners should do instead for optimal summer grass care.
🌱 Who it’s for:
Lawn care enthusiasts and DIY gardeners
Turf professionals looking to apply evidence-based fertilizer practices
Anyone curious about the deeper science behind popular lawn-care products
Drop a comment below: Do you use high-K fertilizers in summer? Why or why not?
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Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
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EmailTravisShaddox@gmail.com
Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf

S3 E38 Tinfoil Turfgrass: More Granular and Foliar Iron Nonsense for Your Lawn.

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 video’s for you.
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Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
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Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf
Diagnostic Criteria for Turfgrass Bullshit Disorder:https://drive.google.com/file/d/1Y_GeVPQ237pzm0ImTP4eVij6I9D0PHPn/view

S3 E37 Perennial Ryegrass Irrigation Rates and Frequency. Plus Tinfoil Turfgrass!

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 insights.
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Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
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Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf

S3 E36 Dr. Dan Sandor - Irrigation Requirements Following Seeding

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 drought-resistant cultivars didn’t show any special advantage during establishment.
In this video, we discuss:
    💧 Why 100% ETo is the sweet spot for seeded lawn irrigation.
    🌱 Why drought resistance in mature turf doesn't translate to faster establishment.
    📉 How less water can slow you down but not necessarily fail you.
    🧠 What this means for homeowners and professionals trying to balance establishment with water conservation.
📄 Paper discussed: Sandor et al. (2021), Irrigation requirements for establishing seeded tall fescue and bermudagrass cultivars in the transition zone
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🧪 Science, skepticism, and sarcasm—it’s all here.📩 Have a comment or question of your own? Drop it below or email me.
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Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
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Podbeanhttps://turfgrassepistemology.podbean.com/
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Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf
Diagnostic Criteria for Turfgrass Bullshit Disorder:https://drive.google.com/file/d/1Y_GeVPQ237pzm0ImTP4eVij6I9D0PHPn/view

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.
📄 Paper discussed: Blankenship et al. (2020), Water Requirements Influenced by Turfgrass Species and Mowing Height in Western Oregon
💧 Learn how this research can help you irrigate less without sacrificing turf quality.🌱 Understand why fine fescues aren’t always the drought champions they’re marketed to be.📏 Discover how mowing height makes a measurable difference in water demand.
🔔 Subscribe to Turfgrass Epistemology for more turf science and myth-busting insights.
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Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
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EmailTravisShaddox@gmail.com
Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf

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.
🧪 Science, skepticism, and sarcasm—it’s all here.📩 Have a comment or question of your own? Drop it below or email me.
Join Turfgrass Epistemology to get access to perks:https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join
Voicemail:859-444-4234
Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
iHeart Radio Podcasthttps://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/
Podbeanhttps://turfgrassepistemology.podbean.com/
Online consultingCalendly.com/TravisShaddox
TwitterTwitter.com/TravisShaddox
EmailTravisShaddox@gmail.com
Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf
Diagnostic Criteria for Turfgrass Bullshit Disorder:https://drive.google.com/file/d/1Y_GeVPQ237pzm0ImTP4eVij6I9D0PHPn/view

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.
🧪 Science, skepticism, and sarcasm—it’s all here.📩 Have a comment or question of your own? Drop it below or email me.
👉 Subscribe to learn how we know what we know.
Join Turfgrass Epistemology to get access to perks:https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join
Article: https://journals.ashs.org/hortsci/view/journals/hortsci/34/5/article-p893.pdf
Voicemail:859-444-4234
Apple Podcasthttps://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379
Spotify Podcasthttps://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI
iHeart Radio Podcasthttps://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/
Podbeanhttps://turfgrassepistemology.podbean.com/
Online consultingCalendly.com/TravisShaddox
TwitterTwitter.com/TravisShaddox
EmailTravisShaddox@gmail.com
Turfgrass Programs and Extension Service Information:https://www.usna.usda.gov/assets/images/as_pdf_image/LandGrantColleges.pdf