Turfgrass Epistemology

Travis Shaddox•turfgrassepistemology.podbean.com

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.

Last refreshed: June 29th, 2025 at 11:32 PM ⓘ

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Episodes

S2 E5 The soil pH diagram. A review.

Hartemink, A.E., Barrow, N.J. Soil pH - nutrient relationships: the diagram. Plant Soil 486, 209–215 (2023). Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Jan 11, 2024•1 hr 7 min•Season 2Ep. 5

S2 E4 Iron source effect on bentgrass.

Glinski, D.S., Carrow, R.N. and Karnok, K.J. (1992), Iron Fertilization Effects on Shoot/Root Growth, Water Use, and Drought Stress of Creeping Bentgrass. Agron. J., 84: 496-503. Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Jan 11, 2024•1 hr 25 min•Season 2Ep. 4

S2 E3 Iron applied with elemental sulfur.

Ryan C. Christensen , Bryan G. Hopkins hopkins@byu.edu , Von D. Jolley , Kelly M. Olson , Christopher M. Haskell , Nicholas J. Chariton & Bruce L. Webb (2012) ELEMENTAL SULFUR IMPREGNATED WITH IRON AS A FERTILIZER SOURCE FOR KENTUCKY BLUEGRASS, Journal of Plant Nutrition, 35:12, 1878-1895. Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Jan 10, 2024•1 hr 17 min•Season 2Ep. 3

S2 E2 Granular vs. foliar Fe, Mn, and Mg fertilizers for turfgrass

Shaddox TW, Unruh JB, Restuccia NG. St. Augustinegrass quality and nutrient content in response to granular and foliar iron, manganese, and magnesium. Crop Science. 2020;60:3314–3327. Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Jan 09, 2024•1 hr 31 min•Season 1Ep. 2

S2 E1 How long does iron fertilizer remain soluble in soil?

Shaddox, T.W., Fu, H., Gardner, D.S., Goss, R.M., Guertal, E.A., Kreuser, W.C., Miller, G.L., Stewart, B.R., Tang, K. and Unruh, J.B. (2019), Solubility of Ten Iron Fertilizers in Eleven North American Soils. Agronomy Journal, 111: 1498-1505. Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Jan 05, 2024•1 hr 25 min•Season 2Ep. 1

S1 E62 Live calls and comments!

I discuss a thatch video claiming to reducing thatch by applying natural organic products, address two comments from an iron video, and talk to callers about iron, soil tests, etc. Live calls and voice mail: 859-444-4234 Live YouTube Show: M, T, W - 10:00 am EST W - 9:00 pm EST Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 28, 2023•1 hr 43 min•Season 1Ep. 62

S1 E61 Comments and emails!

Live calls: 859-444-4234 Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 21, 2023•1 hr 38 min•Season 1Ep. 61

S1 E60 Foliar iron can increase turfgrass growth.

Cooper, R.J., & Spokas, L.A. 1991. Growth, Quality, and Foliar Iron Concentration of Kentucky Bluegrass Treated with Chelated Iron Sources. Journal of the American Society for Horticultural Science. 116(5), 798-801. Calendly.com/TravisShaddox Twitter.com/TravisShaddox Live YouTube Schedule: M, T, W - 10:00 am EST W - 9:00 pm EST

Dec 20, 2023•1 hr 25 min•Season 1Ep. 60

S1 E59 Granular vs. foliar iron applied to severely Fe-deficient Kentucky Bluegrass

D.D. Minner and J.D. Butler. 1984. Correcting Iron Deficiency of Kentucky Bluegrass. HortScience. 19:109-110. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 19, 2023•1 hr 7 min•Season 1Ep. 59

S1 E58 Chelated iron vs. iron sulfate on Kentucky Bluegrass

Yust, A.K., Wehner, D.J. and Fermanian, T.W. (1984), Foliar Application of N and Fe to Kentucky Bluegrass1. Agron. J., 76: 934-938. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 15, 2023•1 hr 5 min•Season 1Ep. 58

S1 E57 Chelated iron + nitrogen ≠ ’double dark’ turfgrass.

Carrow, R.N., Johnson, B.J. and Landry, G.W., Jr. (1988), Centipedegrass Response to Foliar Application of Iron and Nitrogen. Agron. J., 80: 746-750. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 15, 2023•1 hr 31 min•Season 1Ep. 57

S1 E56 Iron and Manganese and Boron, Oh My!

Deal, E.E. and Engel, R.E. 1965. Iron, Manganese, Boron and Zinc: Effects on Growth of Merion Kentucky Bluegrass. Agron. J., 57: 553-555. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 13, 2023•1 hr 13 min•Season 1Ep. 56

S1 E55 Iron for Turfgrasses

An introduction to iron for turfgrasses. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 12, 2023•1 hr 24 min•Season 1Ep. 55

S1 E54 Mowing height, nitrogen, and biostimulants effect on bermudagrass thatch.

Brian J. Tucker, Lambert B. McCarty, Haibo Liu, and Christina E. Wells. 2006. Mowing Height, Nitrogen Rate, and Biostimulant Infuence Root Development of Field-grown TifEagle Bermudagrass. HortScience 41:805-807. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 09, 2023•1 hr 2 min•Season 1Ep. 54

S1 E53 Biological thatch control in zoysiagrass putting greens.

Josh R.Weaver, Lambert B. McCarty, Virgil L. Quisenberry, L. Ray Hubbard Jr., William G. Bridges, Philip J. Brown. 2022. Evaluating biological thatch control on Zoysia matrella (L.) Merr. golf greens. Int Turfgrass Soc Res J. 14:480–486. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 08, 2023•1 hr 29 min•Season 1Ep. 53

S1 E52 Bacteria and cellulase for thatch control does not work, even in Norway.

Tatsiana Espevig, Bjørn Molteberg, Anne Marte Tronsmo, Arne Tronsmo, and Trygve S. Aamlid. 2012. Thatch Control in Newly Established Velvet Bentgrass Putting Greens in Scandinavia. Crop Sci. 52:371–382. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 06, 2023•1 hr 7 min•Season 1Ep. 52

S1 E51 Cultural and biological control of bentgrass thatch

Lambert B. McCarty, Matthew F. Gregg, and Joe E. Toler. 2007. Thatch and Mat Management in an Established Creeping Bentgrass Golf Green. Agron. J. 99:1530–1537. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 05, 2023•1 hr 8 min•Season 1Ep. 51

S1 50 Dr. Sudeep Sidhu - What is lignin and why is it so resistant to decomposition?

Sudeep Sidhu, Qingguo Jack Huang, Robert N. Carrow, David Jesperson, Jiayang Liu, Paul L. Raymer. 2022. A review of a novel enzyme system for the management of thatch and soil water repellency in turfgrass. Int Turfgrass Soc Res J. 14:450–461. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 01, 2023•1 hr 2 min•Season 1Ep. 50

S1 E49 Dr. Paul Raymer - Biodethatching in Bermudagrass and Zoysiagrass.

Sudeep S. Sidhu, Qingguo Huang, Robert N. Carrow, and Paul L. Raymer. 2013. Efficacy of Fungal Laccase to Facilitate Biodethatching in Bermudagrass and Zoysiagrass. Agron. J. 105:1247–1252. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 01, 2023•1 hr 15 min•Season 1Ep. 49

S1 E48 Does fertility and cultivation influence thatch on a bermudagrass home lawn?

R.N. Carrow, B. J. Johnson, and R. E. Burns. 1987. Thatch and Quality of Tifway Bermudagrass Turf in Relation to Fertility and Cultivation. Agron. J. 79:524-530. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 01, 2023•1 hr 14 min•Season 1Ep. 48

S1 E47 Biological and cultural thatch management on newly seeded bentgrass putting greens.

Lambert B. McCarty, Matthew F. Gregg, Joe E. Toler, James J. Camberato, and Hoke S. Hill. 2005. Minimizing Thatch and Mat Development in a Newly Seeded Creeping Bentgrass Golf Green. Crop Sci. 45:1529–1535. Calendly.com/TravisShaddox Twitter.com/TravisShaddox

Dec 01, 2023•1 hr 11 min•Season 1Ep. 47

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