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 E35 Can potassium enhance turfgrass shade tolerance?

Cai, X., Trenholm, L. E., Kruse, J., & Sartain, J. B. (2011). Response of ‘Captiva’ St. Augustinegrass to Shade and Potassium. HortScience horts, 46(10), 1400-1403. Retrieved Mar 26, 2024, from https://doi.org/10.21273/HORTSCI.46.10.1400 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spo...

Mar 27, 2024•1 hr 14 min•Season 2Ep. 35

S2 E34 Nitrogen to Potassium Ratios for Bermudagrass.

Snyder, G.H. and Cisar, J.L. (2000), Nitrogen/Potassium Fertilization Ratios for Bermudagrass Turf. Crop Sci., 40: 1719-1723. https://doi.org/10.2135/cropsci2000.4061719x Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.i...

Mar 26, 2024•1 hr 4 min•Season 2Ep. 34

S2 E33 Will Potassium Increase or Decrease Anthracnose on Poa Annua?

Schmid, C.J., Clarke, B.B. and Murphy, J.A. (2018), Potassium Nutrition Affects Anthracnose on Annual Bluegrass. Agronomy Journal, 110: 2171-2179. https://doi.org/10.2134/agronj2018.03.0147 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Live Show: M, T, W - 10:00 am EST Th - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spot...

Mar 22, 2024•1 hr 17 min•Season 2Ep. 33

S2 E32 Centipedegrass Decline and Recovery Using N, P, and K.

Johnson, B.J., Carrow, R.N. and Burns, R.E. (1988), Centipedegrass Decline and Recovery as Affected by Fertilizer and Cultural Treatments. Agron. J., 80: 479-486. https://doi.org/10.2134/agronj1988.00021962008000030018x Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Live Show: M, T, W - 10:00 am EST Th - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spo...

Mar 21, 2024•1 hr 14 min•Season 2Ep. 32

S2 E31 Dr. Woods - Potassium for Putting Green Turfgrass.

Woods, M.S., Ketterings, Q.M., Rossi, F.S. and Petrovic, A.M. (2006), Potassium Availability Indices and Turfgrass Performance in a Calcareous Sand Putting Green. Crop Science, 46: 381-389. https://doi.org/10.2135/cropsci2005.0218 More information on Dr. Woods and on his potassium publication can be found here: https://www.asianturfgrass.com/publication/woodsetal-2006-crop-sci/ Asian Turfgrass YouTube Channel: https://www.youtube.com/channel/UCnm7lFvxZ85tt9ClUYRtfnw Join Turfgrass Epistemology t...

Mar 20, 2024•1 hr 22 min•Season 2Ep. 31

S2 E30 Turfgrass Potassium. Soils Matter!

Dest, W.M and K. Guillard. 2001. Bentgrass response to K fertilization and K release rates from eight sand rootzone sources used in putting green construction. Int. Turf. Soc. Res. J. 9:375-381. Join this channel to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Live Show: M, T, W - 10:00 am EST Th - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.c...

Mar 19, 2024•1 hr 9 min•Season 2Ep. 30

S2 E29 Potassium Can Increase Disease on Turfgrass

Bier, P.V., Persche, M., Koch, P. et al. A long term evaluation of differential potassium fertilization of a creeping bentgrass putting green. Plant Soil 431, 303–316 (2018). https://doi.org/10.1007/s11104-018-3765-8 Join this channel to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Live Show: M, T, W - 10:00 am EST Th - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast ...

Mar 16, 2024•1 hr 32 min•Season 2Ep. 29

S2 E28 Remove or Return Turfgrass Clippings?

Sartain, J.B. (1993), Interrelationships among Turfgrasses, Clipping Recycling, Thatch, and Applied Calcium, Magnesium, and Potassium. Agron. J., 85: 40-43. https://doi.org/10.2134/agronj1993.00021962008500010008x Live Show: M, T, W - 10:00 am EST Th - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/13...

Mar 14, 2024•1 hr 9 min•Season 2Ep. 28

S2 E27 Potassium source and rate effect on creeping bentgrass

Waddington, D.A., Moberg, E.L. and Duich, J.M. (1972), Effect of N Source, K Source, and K Rate on Soil Nutrient Levels and the Growth and Elemental Composition of Penncross Creeping Bentgrass, Agrostis palustris Huds. Agron. J., 64: 562-566. https://doi.org/10.2134/agronj1972.00021962006400050002x Live Show: M, T, W - 10:00 am EST Th - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify....

Mar 13, 2024•1 hr 3 min•Season 2Ep. 27

S2 E26 Potassium and Phosphorus on Creeping Bentgrass Putting Greens

Johnson, P.G., Koenig, R.T. and Kopp, K.L. (2003), Nitrogen, Phosphorus, and Potassium Responses and Requirements in Calcareous Sand Greens. Agron. J., 95: 697-702. https://doi.org/10.2134/agronj2003.6970 Live Show: M, T, W - 10:00 am EST Th - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgr...

Mar 12, 2024•1 hr 22 min•Season 2Ep. 26

S2 E25 Potassium is Stress-full.

Live Show: M, T, W - 10:00 am EST Th - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/ Podbean https://turfgrassepistemology.podbean.com/ Online consulting Calendly.com/TravisShaddox Twitter Twitter.com/TravisShaddox Email TravisShaddox@gmail.com Turfgrass Program...

Mar 08, 2024•1 hr 27 min•Season 2Ep. 25

S2 E24 Long-Term Influence of N and K on Perennial Ryegrass Turf

Ebdon, J.S., DaCosta, M., Spargo, J. and Dest, W.M. (2013), Long-term Effects of Nitrogen and Potassium Fertilization on Perennial Ryegrass Turf. Crop Science, 53: 1750-1761. https://doi.org/10.2135/cropsci2012.06.0395 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcas...

Mar 07, 2024•1 hr 28 min•Season 2Ep. 24

S2 E23 Kentucky Bluegrass, Potassium, and Nitrogen.

Fitzpatrick, R.J.M. and Guillard, K. (2004), Kentucky Bluegrass Response to Potassium and Nitrogen Fertilization. Crop Science, 44: 1721-1728. https://doi.org/10.2135/cropsci2004.1721 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-12904...

Mar 05, 2024•1 hr 21 min•Season 2Ep. 23

S2 E22 Dr. Richardson - Turfgrass Uptake of Foliar Urea

Stiegler, J.C., Richardson, M.D. and Karcher, D.E. (2011), Foliar Nitrogen Uptake Following Urea Application to Putting Green Turfgrass Species. Crop Sci., 51: 1253-1260. https://doi.org/10.2135/cropsci2010.06.0377 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/13...

Mar 01, 2024•1 hr 10 min•Season 2Ep. 22

S2 E21 Is UMaxx U-seless for Turfgrass?

Guertal, E.A. and Howe, J.A. (2012), Nitrate, Ammonium, and Urea Leaching in Hybrid Bermudagrass as Affected by Nitrogen Source. Agron. J., 104: 344-352. https://doi.org/10.2134/agronj2011.0262 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemo...

Feb 29, 2024•1 hr 5 min•Season 2Ep. 21

S2 E20 Type of Granular Urea Influences Nitrogen Volatilization from Turfgrass

Volk, G.M. (1959), Volatile Loss of Ammonia Following Surface Application of Urea to Turf or Bare Soils. Agron. J., 51: 746-749. https://doi.org/10.2134/agronj1959.00021962005100120016x Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-129...

Feb 29, 2024•1 hr 7 min•Season 2Ep. 20

S2 E19 Kentucky Bluegrass Managed with Sprayable Nitrogen Programs

Moore, R.W., Christians, N.E. and Agnew, M.L. (1996), Response of Three Kentucky Bluegrass Cultivars to Sprayable Nitrogen Fertilizer Programs. Crop Science, 36: 1296-1301. https://doi.org/10.2135/cropsci1996.0011183X003600050037x Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Voicemail: 859-444-4234 Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.ihear...

Feb 28, 2024•1 hr 7 min•Season 2Ep. 19

S2 E18 How much water should you apply after applying urea?

Bowman, D. C., Paul, J. L., Davis, W. B., & Nelson, S. H. (1987). Reducing Ammonia Volatilization from Kentucky Bluegrass Turf by Irrigation. HortScience, 22(1), 84-87. https://doi.org/10.21273/HORTSCI.22.1.84 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology...

Feb 27, 2024•1 hr 15 min•Season 2Ep. 18

S2 E17 February 2024 Comments and Voicemail

Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/ Podbean https://turfgrassepistemology.podbean.com/ Online consulting Calendly.com/TravisShaddox Twitter Twitter.com/TravisShaddox Email TravisShaddox@gmail.com...

Feb 22, 2024•1 hr 46 min•Season 2Ep. 17

S2 E16 Dr. Christians - Do Urease Inhibitors Enhance Turfgrass Quality or Growth?

Joo, Y.K., Christians, N.E., Spear, G.T. and Bremner, J.M. (1992), Evaluation of Urease Inhibitors as Urea Amendments for Use on Kentucky Bluegrass Turf. Crop Science, 32: 1397-1401 cropsci1992.0011183X003200060018x. https://doi.org/10.2135/cropsci1992.0011183X003200060018x Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1...

Feb 22, 2024•38 min•Season 2Ep. 16

S2 E15 Does NBPT increase N uptake in Kentucky bluegrass?

Joo, Y.K., Christians, N.E. and Blackmer, A.M. (1991), Kentucky Bluegrass Recovery of Urea-Derived Nitrogen-15 Amended with Urease Inhibitor. Soil Science Society of America Journal, 55: 528-530. https://doi.org/10.2136/sssaj1991.03615995005500020039x Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI i...

Feb 21, 2024•1 hr 2 min•Season 2Ep. 15

S2 E14 Is stabilized nitrogen worthless for turfgrass?

Henning, S.W., Branham, B.E. & Mulvaney, R.L. Response of turfgrass to urea-based fertilizers formulated to reduce ammonia volatilization and nitrate conversion. Biol Fertil Soils 49, 51–60 (2013). https://doi.org/10.1007/s00374-012-0696-z Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Ra...

Feb 15, 2024•1 hr 6 min•Season 2Ep. 14

S2 E13 Turfgrass quality, urea, and dycandiamide. Is DCD worth the money?💵

Mosdell, D.K., Daniel, W.H. and Freeborg, R.P. (1986), Evaluation of Dicyandiamide-Amended Fertilizers on Kentucky Bluegrass. Agron. J., 78: 801-806. https://doi.org/10.2134/agronj1986.00021962007800050012x Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/po...

Feb 14, 2024•1 hr 6 min•Season 2Ep. 13

S2 E12 Liquid Nitrogen Applied to Kentucky Bluegrass.

Spangenberg, B.G., Fermanian, T.W. and Wehner, D.J. (1986), Evaluation of Liquid-Applied Nitrogen Fertilizers on Kentucky Bluegrass Turf. Agron. J., 78: 1002-1006. https://doi.org/10.2134/agronj1986.00021962007800060014x Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www...

Feb 13, 2024•1 hr 39 min•Season 2Ep. 12

S2 E11 One Nitrogen Application per Year. Will it Work?

Soldat, D.J., Petrovic, A.M. and Barlow, J. (2008). Turfgrass Response to Nitrogen Sources with Varying Nitrogen Release Rates. Acta Hortic. 783, 453-462 Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/ Podbean ...

Feb 08, 2024•1 hr 3 min•Season 2Ep. 11

S2 E10 Nitrogen Fertilizer Pricing

Shaddox, T. W., & Unruh, J. B. (2021). Determining Nitrogen Fertilizer Cost Using Turfgrass Response. HortTechnology. 31(4), 470-478. Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/ Podbean https://turfgras...

Feb 08, 2024•1 hr 38 min•Season 2Ep. 10

S2 E9 Turfgrass Response to Various Nitrogen Sources

Landschoot, P.J., and D.V. Waddington. 1987. Response of turfgrass to various nitrogen sources. Soil Sci. Soc. Am. J. 51:225-230. Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/ Podbean https://turfgrassepistem...

Feb 07, 2024•1 hr 38 min•Season 2Ep. 9

S2 E8 Turfgrass Response to Slow Release Nitrogen Fertilizer

Carrow, R.N. (1997), Turfgrass Response to Slow-Release Nitrogen Fertilizers. Agron. J., 89: 491-496. Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/ Podbean https://turfgrassepistemology.podbean.com/ Online co...

Feb 06, 2024•1 hr 39 min•Season 2Ep. 8

S2 E7 Dr. Glen Obear - Iron Cementing Layers in Golf Putting Greens.

Glen R. Obear, Alfred E. Hartemink, Douglas J. Soldat. 2014. Soils with iron-cemented layers on golf courses in the USA, Geoderma 232–234:198-207. Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/ Podbean https:/...

Feb 04, 2024•1 hr 17 min•Season 2Ep. 7

S2 E6 The soil pH diagram - soil mineralogical and chemical issues.

Barrow, N.J., Hartemink, A.E. The effects of pH on nutrient availability depend on both soils and plants. Plant Soil 487, 21–37 (2023). Live calls and voice mail: 859-444-4234 Live Show: M, T, W - 10:00 am EST W - 9:00 pm EST Apple Podcast https://podcasts.apple.com/us/podcast/turfgrass-epistemology/id1717271379 Spotify Podcast https://open.spotify.com/show/1cTpdrChToeEFAOX9wkXFI iHeart Radio Podcast https://www.iheart.com/podcast/1323-turfgrass-epistemology-129043524/ Podbean https://turfgrasse...

Jan 20, 2024•1 hr 52 min•Season 2Ep. 6

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