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The ATC Doublecut with Micah Woods

Asian Turfgrass Center

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I discuss ATC blog posts, with supplementary information, stories, and the reasons why I thought the topic was worth writing about, and worth reading about. Thus, a doublecut of these topics. This covers grass selection, playability, and all the work done to create a certain type of turfgrass surface.
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In this episode, I discuss sixteen year old bentgrass greens that have also gone sixteen years without P fertilizer. The greens are also free of Poa annua. Then I discuss how fertilizer recommendations made from soil tests are a lot more precise if the time duration over which the fertilizer is being recommended is considered explicitly. And I expl…
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Jim Huntoon joined me from Horry-Georgetown Technical College to discuss overseeding and the hows and whys of this common practice on warm-season turf that goes dormant in winter. We discussed these two blog posts: - https://www.asianturfgrass.com/post/optimum-overseeding-time-windows/ - https://www.asianturfgrass.com/post/zoysia-beats-bermuda-on-s…
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Maggie Reiter joined me to reminisce about the grasses one can find at the back of the 7th green at Pebble Beach Golf Links, to consider soil test results for lawns, what the biggest problems are on lawns and whether solutions exists, and much more. Maggie is a Data Scientist at Sunday, https://www.getsunday.com/ The blog post with the photo of gra…
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This is a follow-up to the episode last week when I mentioned that I was looking at snow outside, that the light would be ample for growth, but the temperatures were below freezing and thus temperature was limiting the growth. I discuss the new blog post that shows those light data. An example of ample DLI: https://www.asianturfgrass.com/post/an-ex…
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The growth potential converts air temperature to a 0 to 1 (or 0 to 100%) scale. Of course, there are a lot more things that affect actual growth, including light, nitrogen, and water. I discuss these and why I'm not so convinced that adding a light factor to GP makes it more useful. The blog post discussed here is https://www.asianturfgrass.com/pos…
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This episode goes through a lot of updates from both the ATC and the PACE Turf websites. Topics discussed include OM246, the problem with frequent soil testing, the problem when getting soil tests done by some fertilizer companies, normal N content of grass leaves, and coefficient of uniformity (Cu) of rootzone sands. More information and and decis…
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Adam Moeller joined me to discuss how to manage greens in 2024. We talked about his research at Purdue University on sand and bentgrass and coring and N rates, and about clipping volume and OM246 testing and how we might manage turf and look at sands today. This post got the Doublecut introduction, about how to figure out an estimate of N harvest f…
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Brian joined me to discuss his recommended soil sampling strategy for an 18 hole golf course. We also discussed what he teaches in a 2 hour GCSAA seminar on physical testing. Mavis Consulting website with lots of resources: http://mavisconsulting.com/ This blog post on soil sampling got the Doublecut treatment: https://www.asianturfgrass.com/post/c…
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The 2018 article by Bryan and Tyler Hopkins, "Carbon: the next frontier in fertilization?" concludes that we "should not be fertilizing with carbon." Bryan joined me to discuss this article. The blog post about their article remains one of the top viewed on the ATC website, six years after publication: https://www.asianturfgrass.com/post/is-carbon-…
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Zoysiagrass can seed year round when the conditions are right. In this episode, I discuss what those conditions are, share some tools for getting a site-specific sand topdressing estimate, describe the reshuffling of top posts on the ATC website, and discuss using a line laser to measure the effective height of cut. I have also recently been the gu…
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Joe Gulotti, The Talking Greenkeeper, joined me to discuss the ATC blog posts that received the fewest views in 2023. We give these topics one more chance, while talking about quality of ball roll, playability, fertilizer, surface firmness, seminars, translation, and much more. The blog post with these 10 blog post "bombs" is https://www.asianturfg…
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With Google Analytics I can check the pages on the ATC website that get the most views. These were the ten posts from 2023 that got the most pageviews. These posts are listed, with direct links to each, at https://www.asianturfgrass.com/post/ten-posts-no-one-read-2023/ Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/…
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I looked through my "Flights and favorite turf photos" post to see what I learned, or what I was reminded of, through these photos. I discuss N rate, grass species, dormancy, traffic, leaf area, crew size, Poa annua, pesticides, and a lot more. This is the post I discussed: https://www.asianturfgrass.com/post/flights-favorite-turf-photos-2023/ I me…
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In 2018, I delivered four presentations/classes at the Continue to Learn education conference in Harrogate, England. Deb Burnett and Sami Strutt from BIGGA joined me to discuss how an education program gets put together and evaluated. The Doublecut post was: https://www.asianturfgrass.com/post/four-presentations-at-btme/ BIGGA website: https://www.…
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Chris Tritabaugh joined me to discuss sand topdressing, a long-running conversation we've been having with Dr. John Kaminski, the quantities of sand and N that are recommended vs. the amounts that seem to be required in modern turf maintenance, and much more. We discussed this post from the ATC website about nitrogen, coring, and sand: https://www.…
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Janne Lehto from Hirsala Golf joined me to discuss robotic automowers. Hirsala Golf currently has a fleet of 36 machines, mowing all fairways and 75% of the rough with these autonomous mowers. We discussed mowing heights, some of the interesting benefits that come with using these types of machines, and discussed a few drawbacks. Find Janne on Ints…
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I talked about some recent blog posts, including updated #OM246 sampling instructions, there is no such thing as an MLSN nitrogen rate, soil samples cannot dry too much, and more. Links to these posts are: - https://www.asianturfgrass.com/post/mlsn-is-not-gp/ - PACE climate appraisal form https://www.paceturf.org/journal/climate - https://www.asian…
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Can soil surfactant (wetting agent) applications be scheduled based on site temperatures? Can a growing degree day model work for this? Dr. Bill Kreuser, president of Greenkeeper, joined me to discuss his exciting progress with this research. - ATC blog post on what wetting agents really do: https://www.asianturfgrass.com/post/what-do-wetting-agent…
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Lake Karrinyup Country Club in Perth, Western Australia has creeping bentgrass greens and sometimes sees high temperatures over 40 °C. Course superintendent Fraser Brown joined me to discuss how he and the maintenance team manage the grass in this year-round golfing climate. Find Fraser on X at https://twitter.com/FraserJBrown_ Read the ATM profile…
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I spoke with Michael Bekken about normal nitrogen rates, why they vary so much, why that matters, what a normal N rate linked to growth potential (GP) might be, and greenhouse gas emissions from turfgrass maintenance. We talked about: - how to keep up with turf info from ATC and PACE Turf, https://www.asianturfgrass.com/post/whats-the-best-way-to-k…
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Dr. Chas Schmid has been involved with many of the same topics I often study and consider---sand topdressing, potassium fertilization, soil organic matter, putting green performance, and so on. His data, and plenty of photographic evidence, also show that there can be completely different outcomes than what I might have expected. We discuss this, o…
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This considers fertilizer programs, whether research can be misleading when fertilizer is applied at fixed rates on calendar schedules, and why I'm excited about the utility of the growth ratio. Blog posts discussed include: - https://www.asianturfgrass.com/post/already-proving-to-be-more-valuable-than-i-originally-expected/ - https://www.asianturf…
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I was a co-author, in 2013, of an article with the title "Documenting your progress toward sustainability." Jon Wall joined me to discuss this topic, and to consider whether keeping track of annual totals of inputs and resource use in a few key areas can be a meaningful way to document sustainable land management practices in the golf industry. The…
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I flipped through four recent blog posts, about zoysia seedheads on putting greens, the practical question of how much organic matter (or total organic material is too much), seminars in France, circle mows, and botanical walks to find grass growing in nature. Links to these posts are: https://www.asianturfgrass.com/post/seedheads-greens-height-zoy…
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Chris Tritabaugh joined me to discuss the #bobbletest scoring scale and the overall utility of this test. It is used for assessing the smoothness and trueness of ball roll on golf course putting greens. I find the measurements useful as a way to systematically adjust maintenance work. The blog post we discussed, with a link to the "Perfectly True" …
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Dr. John Rowland from the USGA Green Section Florida region joined me to discuss soil sampling, seasonal soil pH changes, plus sampling and testing methodology for total organic material (#OM246) tests. We discussed this post: https://www.asianturfgrass.com/post/seasonal-soil-ph-change/ See articles by Dr. Rowland, including the one we discussed ab…
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Everyone knows a golf green is smoothest right after the morning work, with some decrease in smoothness as the day goes on. How much does the smoothness and trueness of the roll decrease? I measured it. The blog post discussed here is: https://www.asianturfgrass.com/post/one-chatter-or-snaking-event-in-every-third-ball-roll/ Linde et.al's article o…
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Bjarni Hannesson joined me to discuss parts per million (ppm) and how that measure of nutrients in the soil can be expressed as a fertilizer rate, and vice versa. This turns out to be really useful. At least Bjarni and I think so. For more, see the #MLSN cheat sheet: https://www.asianturfgrass.com/post/new-mlsn-cheat-sheet/ See the Global Soil Surv…
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The temperature-based growth potential, developed by PACE Turf, transforms the average air temperature to a growth potential (GP). The GP is conveniently scaled from 0 to 1 (or from 0 to 100%, if you prefer), and high GP values indicate that the air temperature is close to an optimum for grass growth. This episodes looks at a very interesting quest…
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An anonymous golf course superintendent wrote that they were "blown away by the quality of these surfaces with an amount of nitrogen I would’ve thought was far too small." I discuss this, and some of the changes I'm made in my thinking about what is "far too small," or not. Also, I discuss some of the preventative fungicide and herbicide applicatio…
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I spent nine days at the KBC Augusta golf tournament in 2023. In this episode, I introduce the blog post with the daily diary of my observations and measurements during the week. You can see the blog post at https://www.asianturfgrass.com/post/tournament-diary-kbc-augusta-2023/ Read more about all kinds of turfgrass topics at https://www.asianturfg…
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Andrew McDaniel and I worked together at Habu CC in July 2001. We also worked together at the 50th KBC Augusta tournament in August 2023. I reflect on, and discuss, both of these, in this episode. The blog post discussed is: https://www.asianturfgrass.com/post/looking-back-at-a-july-with-record-heat-and-drought/ Read more about all kinds of turfgra…
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Andrew McDaniel joined me from the Keya GC maintenance office to discuss firmness measurements of putting greens, using a 4 ton roller on the greens, and why the greens make a crunching noise when walking across them. See the blog post we discussed at: https://www.asianturfgrass.com/post/putting-green-data-from-measurement-to-summary/ See the Short…
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I recorded this from Keya Golf Club, which will host the 50th KBC Augusta golf tournament on korai (Zoysia matrella) putting greens this week. I explained why I find this grass on putting greens so interesting, and some of the measurements I'll be making this week. I discussed this blog post: https://www.asianturfgrass.com/post/tournament-golf-on-z…
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Jason Haines joined me for another #TurfMath episode to explain what the growth ratio is, how he uses it, and how he calibrates it. See this post for the equation and links: https://www.asianturfgrass.com/post/the-growth-ratio-equation/ Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Get ATC newsletters at https://s…
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We discussed the ease of metric units and the utility of knowing some key numbers in turfgrass maintenance. We discussed this post: https://www.asianturfgrass.com/post/attractions-of-metric-units/ Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Get ATC newsletters at https://subscribepage.com/atc_newsletters Turfgra…
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One of the things you can do when you are able to express soil water content as a depth of water, and vice versa, is to express the water loss rate from the soil divided by the reference evapotranspiration. Now you've got a rough estimate of a site specific crop coefficient. I explained how to do that in this post: https://www.asianturfgrass.com/po…
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For as long as I can remember, I've used the easy 1 mm = 1 L = 1% soil volumetric water content (VWC) relationship when converting between water use by grass, ET, irrigation, and soil VWC. Bill Kreuser shared the simple calculation to work this out in inches, for any rootzone depth. The post discussed here is https://www.asianturfgrass.com/post/soi…
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I gave three reasons for my preference that sand topdressing amounts be expressed as a depth. One is consistency and standardization. Depth means the area to which the sand has been applied is already accounted for. Others include easy calculation and integration with #OM246, plus clear communication. The posts discussed here include these: https:/…
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Did you know Japan has as many golf holes as England, Scotland, and New Zealand combined? I visited 11 golf facilities in Japan and discuss some of the interesting equipment and numbers related to the maintenance of those courses. The blog post getting the #ATC2x treatment is: https://www.asianturfgrass.com/post/japan-golf-by-numbers/ The roller wi…
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For any date, time, and location, it's possible to calculate the amount of light grass would get in full sun. I describe how this is done, and show a calculator that will find this value for you. Direct link to the blog post: https://www.asianturfgrass.com/post/shade-and-sun/ Direct link to the PPFD calculator: https://asianturfgrass.shinyapps.io/p…
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A research article recommended two spring and one autumn hollow-tine aerification, supplemented by solid-tine aerification during summer, for creeping bentgrass putting greens in the transition zone. I discussed this, and include links to the article, in this post: https://www.asianturfgrass.com/post/coring-three-times-a-year-is-recommended-when/ R…
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Clouds reduce photosynthetically active radiation by about 25% when you can still see your shadow. When you can't see your shadow, that's about 50% of PAR blocked. And when you can't see your shadow and can't find what part of the sky the sun is in, that's about 75% PAR reduction. Read about this on a cloudy day in Tokyo, and see two apps that allo…
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This episode introduces ΔGP, which is cool-season grass growth potential minus warm-season growth potential. Too many days like that and you won't bother trying to grow cool-season grass anymore. Also, best time of the year to soil sample, a superb podcast from Chris Tritabaugh, and a careful look at the difference between soil organic matter and t…
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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/ArkansasTurf Here are links to some of the topics we dis…
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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/pos…
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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…
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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 discusse…
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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 that…
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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: - …
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