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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S2 E78 Agronomist Gets Fooled by the Soil pH Diagram.
1:29:08
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S2 E77 Bear et al., 1945. The Paper that Started Base Cation Saturation.
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1:05:23
Bear, F. E., Prince, A. L., & Malcolm, J. L. (1945). Potassium needs of New Jersey soils. Rutgers University. http://hdl.handle.net/2027/uiug.30112019729356 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/tur…
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S2 E76 Base Cation Saturation for Fertilization and Liming.
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McLean, E.O., Hartwig, R.C., Eckert, D.J. and Triplett, G.B. (1983), Basic Cation Saturation Ratios as a Basis for Fertilizing and Liming Agronomic Crops. II. Field Studies1. Agron. J., 75: 635-639. https://doi.org/10.2134/agronj1983.00021962007500040014x Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJh…
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S2 E75 More soil testing, more BS!
1:28:39
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1:28:39
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S2 E74 Base Cation Saturation Does Not Work in Growth Chambers Either
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Eckert, D.J. and McLean, E.O. (1981), Basic Cation Saturation Ratios as a Basis for Fertilizing and Liming Agronomic Crops: I. Growth Chamber Studies1. Agron. J., 73: 795-799. https://doi.org/10.2134/agronj1981.00021962007300050012x Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voi…
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S2 E73 The Cost of Soil Test Philosophies
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Olson, R.A., Frank, K.D., Grabouski, P.H. and Rehm, G.W. (1982), Economic and Agronomic Impacts of Varied Philosophies of Soil Testing1. Agron. J., 74: 492-499. https://doi.org/10.2134/agronj1982.00021962007400030022x Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-444…
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S2 E72 When Soil Tests Come Out, the BS Flows!
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S2 E71 Nitrogen Sources, Calcium, and Magnesium on Putting Greens.
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Sartain, J.B. (1985), Effect of Acidity and N Source on the Growth and Thatch Accumulation of Tifgreen Bermudagrass and on Soil Nutrient Retention1. Agron. J., 77: 33-36. https://doi.org/10.2134/agronj1985.00021962007700010009x Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemai…
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S2 E70 Do Calcium to Magnesium Ratios Matter for Bermuda and Rye?
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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 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-444-423…
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S2 E69 Three Salesmen Who Don't Understand Soils Teach You About Soils.
1:23:58
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S2 E68 Base Cation Saturation on Putting Greens?
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59:17
St. John, R.A., Christians, N.E. and Taber, H.G. (2003), Supplemental Calcium Applications to Creeping Bentgrass Established on Calcareous Sand. Crop Sci., 43: 967-972. https://doi.org/10.2135/cropsci2003.9670 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-444-4234 Ap…
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S2 E57 Dr. William Albrecht and the Base Cation Delusion.
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Kopittke, P.M. and Menzies, N.W. (2007), A Review of the Use of the Basic Cation Saturation Ratio and the “Ideal” Soil. Soil Sci. Soc. Am. J., 71: 259-265. https://doi.org/10.2136/sssaj2006.0186 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-444-4234 Apple Podcast htt…
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S2 E66 How NOT to Soil Test with Doc.
1:11:29
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S2 E65 Base Cation Saturation Vs. Sufficiency Level
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Culman SW, Brock C, Doohan D, Jackson-Smith D, Herms C, Chaganti VN, Kleinhenz M, Sprunger CD, Spargo J. Base cation saturation ratios vs. sufficiency level of nutrients: A false dichotomy in practice. Agronomy Journal. 2021; 113: 5623–5634. https://doi.org/10.1002/agj2.20787 Join Turfgrass Epistemology to get access to perks: https://www.youtube.c…
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S2 E64 Four Companies Selling Calcium. Four Times the Pseudoscience.
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S2 E63 History of Soil Balancing
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Chaganti, V.N. and Culman, S.W. (2017), Historical Perspective of Soil Balancing Theory and Identifying Knowledge Gaps: A Review. Crop, Forage & Turfgrass Management, 3: 1-7 cftm2016.10.0072. https://doi.org/10.2134/cftm2016.10.0072 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voi…
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S2 E62 Should You Apply P, K, and Lime Prior to Seeding Turfgrass?
1:20:03
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Turner, T.R. and Waddington, D.V. (1983), Soil Test Calibration for Establishment of Turfgrass Monostands. Soil Science Society of America Journal, 47: 1161-1166. https://doi.org/10.2136/sssaj1983.03615995004700060021x Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-44…
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S2 E61 Soil Testing: P, K, Mg, SO4-2, and Mn
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S2 E60 Soil Testing: pH, Salinity, and Cation Exchange Capacity
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S2 E59 Soil Testing: Methods and Philosophy
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S2 E58 Soil Testing: Sampling Depth and Timing
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S2 E57 Advanced Fertilizer Formulations for Turfgrass
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S2 E56 Fertilizer Ratios and Multi-Nutrient Raw Materials.
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S2 E55 Fertilizer Production, Ordering, and Formulation for Turfgrass
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S2 E54 Dr. Gregg Munshaw - What is Bluemuda?
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S2 E53 Fertilizer Raw Materials for Turfgrass
1:39:33
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1:39:33
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S2 E51 Bias Against Disconfirmatory Evidence
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1:08:12
Woodward TS, Buchy L, Moritz S, Liotti M. A bias against disconfirmatory evidence is associated with delusion proneness in a nonclinical sample. Schizophr Bull. 2007 Jul;33(4):1023-8. doi: 10.1093/schbul/sbm013. Epub 2007 Mar 8. PMID: 17347526; PMCID: PMC2632321. Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC…
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S2 E50 Depression and Pesticide Exposure
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Beseler CL, Stallones L, Hoppin JA, Alavanja MC, Blair A, Keefe T, Kamel F. Depression and pesticide exposures among private pesticide applicators enrolled in the Agricultural Health Study. Environ Health Perspect. 2008 Dec;116(12):1713-9. doi: 10.1289/ehp.11091. Epub 2008 Sep 9. PMID: 19079725; PMCID: PMC2599768. Join Turfgrass Epistemology to get…
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S2 E49 The Dunning-Kruger Effect
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Kruger J, Dunning D. Unskilled and unaware of it: how difficulties in recognizing one's own incompetence lead to inflated self-assessments. J Pers Soc Psychol. 1999 Dec;77(6):1121-34. doi: 10.1037//0022-3514.77.6.1121. PMID: 10626367. Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join V…
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S2 E48 Repeated Statements and Illusory Truth
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Hasher, L., Goldstein, D., & Toppino, T. (1977). Frequency and the conference of referential validity. Journal of Verbal Learning & Verbal Behavior, 16(1), 107–112. https://doi.org/10.1016/S0022-5371(77)80012-1 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-444-4234 A…
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S2 E47 Mental Health Barriers in the U.S.
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Mojtabai R, Olfson M, Sampson NA, Jin R, Druss B, Wang PS, Wells KB, Pincus HA, Kessler RC. Barriers to mental health treatment: results from the National Comorbidity Survey Replication. Psychol Med. 2011 Aug;41(8):1751-61. doi: 10.1017/S0033291710002291. Epub 2010 Dec 7. PMID: 21134315; PMCID: PMC3128692. Join Turfgrass Epistemology to get access …
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S2 E46 Barriers to Mental Health Worldwide
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Andrade LH, Alonso J, Mneimneh Z, Wells JE, Al-Hamzawi A, Borges G, Bromet E, Bruffaerts R, de Girolamo G, de Graaf R, Florescu S, Gureje O, Hinkov HR, Hu C, Huang Y, Hwang I, Jin R, Karam EG, Kovess-Masfety V, Levinson D, Matschinger H, O'Neill S, Posada-Villa J, Sagar R, Sampson NA, Sasu C, Stein DJ, Takeshima T, Viana MC, Xavier M, Kessler RC. B…
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S2 E45 What Motivates You and Your Employees?
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1:22:36
Maslow, A. H. (1943). A theory of human motivation. Psychological Review, 50(4), 370–396. https://doi.org/10.1037/h0054346 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 S…
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S2 E44 Topdressing Salt-Affected Fairways Using Humus
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Zhu, H., & Li, D. (2018). Using Humus on Golf Course Fairways to Alleviate Soil Salinity Problems. HortTechnology hortte, 28(3), 284-288. Retrieved Apr 28, 2024, from https://doi.org/10.21273/HORTTECH03989-18 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-444-4234 App…
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S2 E43 Humic-Coated Urea on Kentucky Bluegrass
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1:25:41
Lindsey, A. J., Thoms, A. W., McDaniel, M. D., & Christians, N. E. Plant-available soil nitrogen fluxes and turfgrass quality of Kentucky bluegrass fertilized with humic substances. Crop Science. 2021; 61: 4416–4424. https://doi.org/10.1002/csc2.20592 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmAR…
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S2 E42 Dr. Ervin - Seaweed and Humic Acid Influence Bentgrass Drought Resistance
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1:07:19
Zhang, X. and Ervin, E.H. (2004), Cytokinin-Containing Seaweed and Humic Acid Extracts Associated with Creeping Bentgrass Leaf Cytokinins and Drought Resistance. Crop Science, 44: 1737-1745. https://doi.org/10.2135/cropsci2004.1737 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voic…
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S2 E41 Bermudagrass Response to Microbial Inoculants.
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Bolton, C., Cabrera, M. L., Habteselassie, M., Poston, D., & Henry, G. M. (2022). The impact of commercially available microbial inoculants on bermudagrass establishment, aesthetics, and function. Crop, Forage & Turfgrass Management, 8, e20190. https://doi.org/10.1002/cft2.20190 Join Turfgrass Epistemology to get access to perks: https://www.youtub…
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S2 E40 Humic-coated Urea ≠ Better Turfgrass
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Lindsey AJ, Thoms AW, McDaniel MD, Christians NE. Evaluation of humic fertilizers on a sand-based creeping bentgrass putting green. Crop Science. 2021; 61: 3734–3745. https://doi.org/10.1002/csc2.20577 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/channel/UC-UZnHkJhAmARDZ4YoHnc_A/join Voicemail: 859-444-4234 Apple Podc…
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S2 E39 Late-Season Biostimulant Effects on Bermudagrass
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Munshaw, G.C., Ervin, E.H., Shang, C., Askew, S.D., Zhang, X. and Lemus, R.W. (2006), Influence of Late-Season Iron, Nitrogen, and Seaweed Extract on Fall Color Retention and Cold Tolerance of Four Bermudagrass Cultivars. Crop Science, 46: 273-283. https://doi.org/10.2135/cropsci2005.0078 Join Turfgrass Epistemology to get access to perks: https://…
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S2 E38 Biostimulant effects on creeping bentgrass.
1:20:58
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1:20:58
Ervin, E.H., Zhang, X., Goatley, J.M., Jr., & Askew, S.D. (2004). Trinexapac-ethyl, Propiconazole, Iron, and Biostimulant Effects on Shaded Creeping Bentgrass. HortTechnology horttech, 14(4), 500-506. Retrieved Apr 8, 2024, from https://doi.org/10.21273/HORTTECH.14.4.0500 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com/c…
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S2 E37 Will Applied Potassium Protect Turfgrass from Winter Injury?
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Schmid, C.J., Murphy, J.A., Clarke, B.B., DaCosta, M. and Ebdon, J.S. (2016), Observations on the Effect of Potassium on Winter Injury of Annual Bluegrass in New Jersey in 2015. Crop, Forage & Turfgrass Management, 2: 1-4 cftm2015.0170. https://doi.org/10.2134/cftm2015.0170 Join Turfgrass Epistemology to get access to perks: https://www.youtube.com…
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S2 E36 Bermudagrass Response to Applied Potassium.
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Sartain, J.B. (2002), Tifway Bermudagrass Response To Potassium Fertilization. Crop Sci., 42: 507-512. https://doi.org/10.2135/cropsci2002.5070 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-episte…
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S2 E35 Can potassium enhance turfgrass shade tolerance?
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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/joi…
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S2 E34 Nitrogen to Potassium Ratios for Bermudagrass.
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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/…
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S2 E33 Will Potassium Increase or Decrease Anthracnose on Poa Annua?
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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…
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S2 E32 Centipedegrass Decline and Recovery Using N, P, and K.
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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,…
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S2 E31 Dr. Woods - Potassium for Putting Green Turfgrass.
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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/public…
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S2 E30 Turfgrass Potassium. Soils Matter!
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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 …
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S2 E29 Potassium Can Increase Disease on Turfgrass
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1:31:49
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…
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