The ATC Doublecut with Micah Woods

Mike Richardson from the University of Arkansas joined me to discuss zoysia on putting greens, light requirements of different grass species, grass selection in the transition zone, green speed, and winterkill in a wide ranging conversation. You can find Mike on Twitter at https://twitter.com/ArkansasTurfHere are links to some of the topics we discussed:- This post with the green speed by species kicked off this doublecut: https://www.asianturfgrass.com/post/green-speed-ridgeline-plot/- Warm-season grass NTEP green speed: https://www.asianturfgrass.com/post/zoysia-green-speed/- Thomas Walton's thesis about Lazer and Tifeagle on greens: https://scholarworks.uark.edu/etd/4396/- Video with Tyler Carr about greens-type zoysia in Knoxville: https://youtu.be/oNw9fPqm6YY- Article by Karcher, Richardson, and O'Brien on measuring light: https://gcmonline.com/course/environment/news/turfgrass-light-requirements- Travis Russell's thesis on daily light integral: https://scholarworks.uark.edu/etd/2778/- Global DLI app to find DLI at your location: https://youtu.be/6kPkHRVIAww- The Turfgrass Twilight zone, from a 1952 report: https://www.asianturfgrass.com/post/turfgrass-twilight-zone/Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

I wrote a blog post that lists ten things I reflected on one day in relation to how I had changed my thinking about how much N, growth, and sand topdressing and core aerification are required to maintain high performance turfgrass surfaces. Chris Tritabaugh joined me to discuss this.Blog post with the ten points: https://www.asianturfgrass.com/post/reflections-on-growth-rate-and-nitrogen/Chris's podcast & newsletter: https://ctunderscoreturf.substack.com/ATC Office Hours discussion with Richard Forsyth: https://www.youtube.com/live/T-w6CQzGzKc?feature=shareATC Doublecut about organic matter and organic material terminology with Brian Whitlark: https://youtu.be/tMfby5xR2IMChris Tritabaugh and I talking about #OM246 and putting green maintenance on two ATC Office Hours: first (https://www.youtube.com/live/J5_5mDJ-Vxc?feature=share) second (https://www.youtube.com/live/LUEifgCMhyw?feature=share)Quantifying golf course nitrogen use efficiency by Bekken and Soldat: https://doi.org/10.1002/glr2.12024Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

This episode discusses three recent posts about soil testing (soil nutrient analyses), from what happens at the lab, to micronutrient test results.- Brookside Lab video tour: https://www.asianturfgrass.com/post/behind-the-scenes-look-at-soil-testing/- The video: https://youtu.be/PyL2bfdiBdE- Converting between different extraction methods: https://www.asianturfgrass.com/post/converting-between-soil-test-extraction-methods/- Manganese and the MnAI: https://www.asianturfgrass.com/post/manganese-in-soils-and-the-mnai/I also mentioned the increase in available N that can happen when soils are stored in a field wet condition at ambient air temperatures: https://www.asianturfgrass.com/post/reminder-to-air-dry-soil-samples/Get the ATC blog by email at https://subscribepage.com/atc_blog_emailTo get on the ATC soil test email list, sign up here: https://subscribepage.com/soilRead more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

Joe Gulotti joined me to go through the list of blog posts that got the fewest views on the ATC website in 2020. There was turf tourism, turf hacks, soil sampling, photosynthetically active radiation, four wheelers, and a lot of turf talk as we went through the list. To get the ATC blog by email: https://subscribepage.com/atc_blog_email We discussed this post: https://www.asianturfgrass.com/post/ten-posts-no-one-read-last-year/ The Talking Greenkeeper podcast: https://podcasts.apple.com/us/podcast/the-talking-greenkeeper/id1435947281 Follow Joe Gulotti on Twitter: https://twitter.com/hardg43 We discussed a recent ATC Office Hours with Richard Forsyth: https://www.youtube.com/live/T-w6CQzGzKc?feature=share And a recent ATC Doublecut with Brian Whitlark: https://youtu.be/tMfby5xR2IM The Global DLI app, to find the past year of photosynthetically active radiation anywhere in the world, is at: https://asianturfgrass.shinyapps.io/global_dli/ Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Find turfgrass information and decision-making tools at https://www.paceturf.org/ See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturf See the ATC newsletters at https://subscribepage.com/atc_newsletters Listen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/ Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

Brian Whitlark is the West region director of the USGA Green Section. We talked about total organic material testing of turfgrass soils. This is distinct from soil organic matter testing. Soil organic matter is measured on material that has already passed a 2 mm sieve and thus is no larger than a grain of sand. This sieving removes much of the thatch and mat and living plant material from the sample. There's more about this, including definitions of various items related to this, in https://www.asianturfgrass.com/post/organic-matter-terminology-in-turfgrass-soils/ You can see how a soil sample is tested in this video from Brookside Labs https://youtu.be/PyL2bfdiBdE Richard Forsyth from Royal Melbourne also spoke about something related to the shear strength that Brian and I discussed https://www.youtube.com/live/T-w6CQzGzKc?feature=share Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ See the ATC YouTube channel at https://www.youtube.com/@asianturfgrass Find turfgrass information and decision-making tools at https://www.paceturf.org/ See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturf See the ATC newsletters at https://subscribepage.com/atc_newsletters Listen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/ Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

Dandelion (Taraxacum officinale) abundance can be increased by potassium (K) and lime applications. Adding K fertilizer when it is not needed by the grass, or adding lime to increase the pH when the grass does not require such an adjustment, could lead to increased competitiveness of dandelions in that sward.Some links for this episode include:- My dandelions and potassium post: https://www.asianturfgrass.com/post/potassium-dandelions/- Tilman et al.'s article on biological weed control of dandelions: https://doi.org/10.1890/1051-0761(1999)009[0103:BWCVNC]2.0.CO;2- The article with Frank Rossi about Park Grass from the Green Section Record: https://www.asianturfgrass.com/post/fertilizer-and-weeds-at-park-grass/- Park Grass photo gallery: https://www.asianturfgrass.com/post/park-grass-photos/- Rothamsted's Park Grass experiment video: https://youtu.be/-3-Pm5JUQZ4 Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Find turfgrass information and decision-making tools at https://www.paceturf.org/ See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturf See the ATC newsletters at https://subscribepage.com/atc_newsletters Listen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/ Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

I used to tell people that GP is just a number, and if they wanted to modify it to fit the way grass grows at their location, then go ahead and do so. I don't say that anymore. Instead, I recommend using the standard equation. Why? To facilitate direct comparisons between sites, knowing that everyone has used the same equation.I discussed this blog post: https://www.asianturfgrass.com/post/regarding-gp-and-adjustments/PACE Turf's updated listing of turf diagnostic labs is available at: https://www.paceturf.org/public/turf_diagnostic_labsRead more about OM246 tests at: https://www.asianturfgrass.com/project/om246/ Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Find turfgrass information and decision-making tools at https://www.paceturf.org/ See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturf See the ATC newsletters at https://subscribepage.com/atc_newsletters Listen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/ Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

March in Japan is the start of cherry blossom season, and on golf courses there is a lot of aerification. I've noticed that golf courses in Japan generally don't do as much surface area removal as is common in some other parts of the world. But the surfaces can still perform. I discuss this in this episode, and have a look at this post from the ATC blog: https://www.asianturfgrass.com/post/springtime-golf-course-maintenance-in-japan/Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

I explained what the growth ratio is and showed the equation used to calculate growth ratio. This simple equation takes the measured clipping volume and adjusts it by the temperature. Jason Haines developed the growth ratio and has found it quite useful. You can see that equation in this ATC blog post: https://www.asianturfgrass.com/post/the-growth-ratio-equation/Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

One of the common questions about #ClipVol is "what is a normal amount of clippings to get?" By using the growth ratio, it's possible to account for the temperature conditions through the year and from that calculate how many clippings would be normal for any day in the year.The specific blog post discussed was https://www.asianturfgrass.com/post/what-should-my-clipvol-be/You can see the growth ratio equation in this post: https://www.asianturfgrass.com/post/the-growth-ratio-equation/Other links discussed in this episode include:- growth ratio posts on the ATC site https://www.asianturfgrass.com/tag/growth-ratio/- growth ratio posts on Jason Haines' blog https://fusariummy.blogspot.com/search/label/growth%20ratio- the GP Avatar app https://www.asianturfgrass.com/post/the-gp-avatar-is-updated/- turf videos organized by playlists https://www.asianturfgrass.com/post/turf-video-playlists/- new seminar handouts section on the ATC site https://www.asianturfgrass.com/post/new-seminar-section/- that information-packed 20 minute podcast with Chris Tritabaugh and Adam Moeller https://www.asianturfgrass.com/post/putting-green-measurements/Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

Bill Kreuser joined to answer all the questions I could think of related to plant growth regulators (PGR). We discussed re-application intervals based on growing degree days for multiple turf species, and a lot of things related to growth rate and PGR use in general.Some of the items we discussed include:- The blog post getting the ATC Doublecut treatment, https://www.asianturfgrass.com/post/using-plant-growth-regulators-on-golf-course-putting-greens/- Bill's GSR article from 2015, Effective use of plant growth regulators on golf putting greens: https://gsr.lib.msu.edu/article/kreuser-effective-4-3-15.pdf- Reasor et al.'s article on Growing Degree Day Models for Plant Growth Regulator Applications on Ultradwarf Hybrid Bermudagrass Putting Greens: https://doi.org/10.2135/cropsci2018.01.0077- Brown et al.'s article on Growing degree-days optimize trinexapac-ethyl reapplications on ultradwarf bermudagrass putting greens: II. Testing a reapplication schedule: https://doi.org/10.1002/csc2.20387- The Greenkeeper App: https://www.greenkeeperapp.com- Follow Bill Kreuser on Twitter at https://twitter.com/PGRBillRead more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

In 2020, I looked at the temperatures in Augusta during the April Masters Tournament week, and the temperatures in November during the re-scheduled Masters dates. From those temperatures, I calculated the growth potential: https://www.asianturfgrass.com/post/turfgrass-gp-april-november/For more about the temperature-based turfgrass growth potential, see https://www.asianturfgrass.com/tag/growth-potential/Watch this episode at https://youtu.be/A_odktP6CAkRead more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

I spoke with Scott Mingay and Jordan Booth from the USGA about the GS3 tool that measures green speed, smoothness and trueness of ball roll, and surface hardness of golf course turf. Links:Bobble Test video: https://www.asianturfgrass.com/post/teaching-the-bobble-test-video/USGA Green Section website: https://gsshop.usga.org/Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

Soil nutrient levels might change more rapidly than you realize. This has implications for whether nutrients should be applied as fertilizer, or not. I showed data from an experiment I did when I was a graduate student in this blog post:https://www.asianturfgrass.com/post/soil-nutrient-levels-change/Jason Haines has written about a similar topic, and explained it perhaps more clearly than I have. I recommend his blog post on "Do you have enough?": https://fusariummy.blogspot.com/2023/02/do-you-have-enough.htmlTo read more about this experiment, see this chapter in my dissertation: http://archive.lib.msu.edu/tic/thesdiss/woods2006h.pdfRead more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

I recommend keeping the soil pH between 5.5 and 8.5 when you are managing fine turfgrass. This episode explains why that is the recommended range, and also considers the recent GCSAA nutrient survey and the phenomenon of different N, P, and K application rates between those who soil test and those who do not.The blog posts discussed in this episode are: https://www.asianturfgrass.com/post/a-soil-ph-chart-that-i-like/ https://www.asianturfgrass.com/post/turfgrass-soil-testing-might-be-getting-better/ https://www.asianturfgrass.com/post/putting-green-measurements/ Watch this episode at https://youtu.be/kRDPVAtTLro Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Find turfgrass information and decision-making tools at https://www.paceturf.org/ See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturf See the ATC newsletters at https://subscribepage.com/atc_newsletters Listen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/ Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

Turfgrass soil test interpretation and the fertilizer recommendations that come from that have been highlighted as "arbitrary" and "based on other crops" and "needing more research." I suggest the #MLSN method as a way to bypass a lot of these problems, and Dr. Beth Guertal joined me to talk about this fascinating topic. We discussed the post "Best judgment of the agronomist" which has a link to the #MLSN cheat sheet, plenty of quotes from the past 50 years about this problem, and links to plenty of information about making sure you apply just the right amount of fertilizer: https://www.asianturfgrass.com/post/best-judgment-of-the-agronomist/  A discussion about potassium with Doug Soldat is at https://youtu.be/ilPhk30NQlQ Follow Dr. Guertal on Twitter at https://twitter.com/AUTurfFert Watch this episode at https://youtu.be/_xvII52YsZQ Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Find turfgrass information and decision-making tools at https://www.paceturf.org/ See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturf See the ATC newsletters at https://subscribepage.com/atc_newsletters Listen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/ Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

Bjarni Hannesson has been using the temperature-based turfgrass growth potential (GP) for ten years. We discussed how he makes use of it in Iceland, and how the GP can be used to predict when and how much N fertilizer may be required to produce the desired growth rate.We discussed this blog post, to begin with: https://www.asianturfgrass.com/post/which-more-effect-growth-light-or-temperature/We also discussed the link to download slides and a handout from my 2013 presentation about GP and its link to N rate through probable growth: https://www.asianturfgrass.com/post/method-for-estimating-turfgrass-nutrient-requirements-iceland-report/For photos of turfgrass and golf courses in Iceland, I've put a photo gallery here: https://www.asianturfgrass.com/post/turfgrass-in-iceland/Watch this episode at: https://youtu.be/jSPJ0mGLZ7kRead more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

The temperature-based turfgrass growth potential (GP) is a utility function that expresses the potential of temperature to affect shoot growth. Without going into too many numbers or the GP equation, I explained what GP is and how it is used.I discussed these posts and shows about GP: - https://www.asianturfgrass.com/post/gp-explained-photos/- https://www.asianturfgrass.com/post/gp-as-proxy-for-season-length/- The ATC Office Hours episode with Larry Stowell about GP: https://www.youtube.com/live/oZgXv3ZaHkQ?feature=share- PACE Turf climate appraisal forms with the GP equation embedded: https://www.paceturf.org/journal/climate Watch this episode at https://youtu.be/RK8hzJcep40 Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Find turfgrass information and decision-making tools at https://www.paceturf.org/ See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturf See the ATC newsletters at https://subscribepage.com/atc_newsletters Listen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/ Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

Doug Soldat is a professor in the soil science department at the University of Wisconsin-Madison. We discussed a recent photo he shared showing dramatically increased snow mold where K fertilizer was applied. Or perhaps it was dramatically reduced snow mold where K fertilizer was not applied.- See the photo we discussed: https://www.asianturfgrass.com/post/k-fertilizer-and-more-snow-mold/- Watch this episode at https://youtu.be/ilPhk30NQlQ- Bier et al. article on K supply from topdressing sand: A long term evaluation of differential potassium fertilization of a creeping bentgrass putting green, https://doi.org/10.1007/s11104-018-3765-8- If you are in the USA and would like to send your topdressing sand for an analysis of K content, you can send to Dr. Soldat at this address:Dept of Soil ScienceAttn: Doug Soldat1525 Observatory Dr.Madison, WI  53706-1299Regarding samples, these have to come from the USA. Soils require an import permit to enter the USA and he doesn't have a permit for samples for this project. US samples only, please.- Dest and Guillard on non-exchangeable K, Bentgrass response to K fertilization and K release rates from eight sand rootzone sources used in putting green construction, available at https://opencommons.uconn.edu/plsc_articles/13/- The pH chart article we discussed is by Hartemink and Barrow, Soil pH - nutrient relationships: the diagram, https://doi.org/10.1007/s11104-022-05861-zRead more about all kinds of turfgrass topics at https://www.asianturfgrass.com/Find turfgrass information and decision-making tools at https://www.paceturf.org/See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturfSee the ATC newsletters at https://subscribepage.com/atc_newslettersListen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/

Detailed answers are at https://www.asianturfgrass.com/post/soil-sampling-and-interpetation-questions-om246-mlsn/I also recommended these blogs/newsletters:Chris Tritabaugh's ct_turf newsletter: https://ctunderscoreturf.substack.com/Jason Haines' Fusariummy blog: https://fusariummy.blogspot.com/See the ATC newsletters at https://subscribepage.com/atc_newsletters Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Find turfgrass information and decision-making tools at https://www.paceturf.org/ See the PACE Turf YouTube channel at https://www.youtube.com/user/paceturf Listen to the ATC Doublecut with Micah Woods podcast at https://atc-doublecut.transistor.fm/ Listen to the ATC Office Hours podcast at https://atc-office-hours.transistor.fm/