The ATC Doublecut with Micah Woods

Janne Lehto from Hirsala Golf in Finland attended the 15th International Turfgrass Research Conference (ITRC) in Japan. We discussed the heat and humidity in Japan during summer, saunas, his golfing experiences in Japan, and the ITRC. The blog post with information about heat and humidity is: https://www.asianturfgrass.com/post/japan-hot-humid-latitude/ Read more about all kinds of turfgrass topic...

John Forrest and Jeff Austen joined me from Western Australia to discuss layers in the rootzone, the educational system and apprenticeships, and sand. We looked at photos of layers in this post: https://www.asianturfgrass.com/post/layers-in-the-rootzone/ Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/ Find a suite of decision-making tools at https://www.paceturf.or...

How do you compare sands to show to what degree one is finer or coarser than another? I've been trying to figure out an easy way to visualize this with comparison to reference materials. Adam Moeller joined me to discuss sands, Ksat, the coefficient of uniformity, particle sizes, and more. We discussed this blog post: https://www.asianturfgrass.com/post/sands-coarse-fine/ This is the Frankly Speak...

John Emerson is an extension agent for the University of Delaware who has completed a statewide soil sampling project from good performing turf across the state. We talked about this project, and about nutrient management of turfgrass more generally, in this episode. We discussed this post: https://www.asianturfgrass.com/post/good-turf-bad-turf-and-mlsn/ Read more about all kinds of turfgrass topi...

The D50 is a value that represents the median particle diameter in a sand. I calculated the D50 for 302 sands from around the world, and 15% of them are finer than the limit defined by the USGA Recommendations for a Method of Putting Green Construction. Read about this at https://www.asianturfgrass.com/post/d50-median-sand-diameter/ Read more about all kinds of turfgrass topics at https://www.asia...

I explain that moving from full sun to tree shade reduced photosynthetically active radiation by about 80%. I show an app, and a PACE Turf document, that will allow you to find both PPFD and DLI no matter where you are located. I discussed these links: - https://www.asianturfgrass.com/post/shade-and-sun/ - https://asianturfgrass.shinyapps.io/ppfd_by_time/ - https://www.paceturf.org/memberedition/w...

John Petrovsky is manager of USGA Green Section Education. He is also the host of the USGA Green Section podcast. We discussed a recent episode about GvX that had an especially insightful quote from Chris Tritabaugh. Also, the U.S. Open, championship golf, clipping volume, and even a bit about MLSN. Links for topics we discussed include: USGA Green Section Record free subscription https://www.usga...

Geoff Fenn and I discussed the use of the turfgrass growth potential (GP) in the UK, optimum temperatures, the GvX, clipping volume, and more in this episode that started with a look at this blog post: https://www.asianturfgrass.com/post/number-between-1-0-using-the-turfgrass-growth-potential/ See also this on GP and adjustments: https://www.asianturfgrass.com/post/regarding-gp-and-adjustments/ Al...

I discussed some green speed and green firmness data from measurements made at the Sky RKB Ladies Classic tournament, and I explained why the geometric mean rather than the arithmetic mean can be especially useful (and safe) when dealing with soil nutrient data. Green speed change from morning to afternoon: https://www.asianturfgrass.com/post/speed-drop-morning-to-afternoon/ The geometric mean as...

In this episode I picked some of my favorite photos from 2024, and I remembered what I learned from them. From roots, layers, OM246, zoysia greens, and drought, to loupes, turf farms, compost, and bermudagrass. I discussed this post: https://www.asianturfgrass.com/post/flights-favorite-turf-photos-2024/ Here's the sand vs. compost ball bounce video: https://www.youtube.com/watch?v=r1LV77z_Ziw Read...

There have been a lot of conversations about soil water content and surface hardness (firmness). I discuss some measurements that I have made, and suggest some of the old posts on the ATC website that discuss this topic. Specific posts discussed include: https://www.asianturfgrass.com/post/measuring-surface-hardness-on-greens-fairways-and-approaches/ https://www.asianturfgrass.com/post/relationshi...

Jason came up with the GvX idea in a flash of inspiration that he describes here. This is the actual growth of the grass compared to the expected growth of the grass, and it has surprising practical implications. We discussed the development and use of the #TurfGvX in this episode. We discussed this blog post: https://www.asianturfgrass.com/post/explaining-gvx/ See the GvX screencast video at http...

Achieving the lowest possible #OM246 total organic material value is not desirable, because the living plant material is part of the OM measured with this method.  I discussed this post: https://www.asianturfgrass.com/post/om246-measures-living-om-too/  @keyakeeper469  and I discussed 8 years of OM246 in https://youtu.be/8B3FQhvSIdI OM246 project page https://www.asianturfgrass.com/project/om246/...

A common way to calculate average daily temperature is to take the sum of the daily maximum and daily minimum temperatures, and to divide by two. A better statistical approximation of the average temperature is to take measurements made every hour and then to find the mean value of those continuous measurements. This blog post shows a comparison of the three methods for 2024 data at three location...

Joe Gulotti joined me to discuss his new job, The Talking Greenkeeper, and the ten posts on the ATC website that no one (practically) read in 2024. This is the post that lists all the "bombs:" https://www.asianturfgrass.com/post/ten-posts-no-one-read-2024/ The Talking Greenkeeper catalog is at https://podcasts.apple.com/us/podcast/the-talking-greenkeeper/id1435947281 Read more about all kinds of t...

Although turf research is often done with fertilizer treatments applied at constant rates and on a fixed calendar schedule, that way of supplying nutrients seems strange to me now. I explain why in this episode, and suggest a better method. We discussed this post: https://www.asianturfgrass.com/post/fertilizer-schedule-seems-strange-to-me-now/ Read more about all kinds of turfgrass topics at https...

I recommend 4 podcast episodes and one useful app that calculates sand topdressing amounts, then quickly discuss the top 10 new posts from the ATC website in 2024. Would you like to comment or have questions about this episode? Reply on Bluesky Here are topic links: - https://www.asianturfgrass.com/post/top-10-posts-2024/ - https://www.asianturfgrass.com/post/the-rodney-lingle-system/ - https://ww...

Green speed varies because of many factors. One of those factors is clipping volume. I discuss that relationship and give some advice for those getting started with clipping volume and wanting to know how to adjust it. We discussed this blog post: https://www.asianturfgrass.com/post/getting-started-with-clipping-volume/ Potassium increases dollar spot? https://www.paceturf.org/memberedition/potass...

Did you know there was a time when up to to 2 lbs N per 1000 square feet per growing month, the equivalent of 100 kg of actual N per ha per month, was a standard recommendation for putting green turf? I talk about this and some implications in this episode. The ATC post getting the double cut treatment is https://www.asianturfgrass.com/post/nitrogen-rate-as-a-pendulum-swing/ I also took a look at...

Bill Kreuser from GreenKeeper joined me to discuss how much grass grows, the complicated problems involved when sand is mixed with clippings, growth regulator adjustments, leaf nutrient content, soil surfactant effect duration, and more. #ClipVol We discussed the "Sand in clippings" post from the ATC website: https://www.asianturfgrass.com/post/sand-in-clippings/ You can read more about our discus...

Frank Rossi, Ph. D. is the New York State extension turfgrass specialist at Cornell University. We talked about mentorship, potassium, turf nutrition, smoothness of putting greens, dogma, data, budgets, and more. Here are some links: - https://cals.cornell.edu/frank-s-rossi - New podcast, Turf Without Borders: https://turfwb.asianturfgrass.com/episodes/st-andrews-old-new-jubilee-with-jon-wood - ht...

The PACE Turf growth potential equation has one variable (the actual air temperature) and two constants. The constants are optimum air temperature and a term for variance that controls the shape of the curve as the actual temperature moves away from the optimum temperature. It's a little more complicated than that, because the constants change depending on whether you are making the calculation fo...

You can expect soil organic matter to be 5% nitrogen, and you can expect from 1 to 4% of that organic nitrogen to mineralize in one year. You can also calculate estimated daily mineralization and sum it to get weekly, monthly, and annual totals. The blog post discussed is: https://www.asianturfgrass.com/post/estimating-nitrogen-mineralization-an-example/ Subscribe to the Turf Without Borders podca...

This episode introduces multiple experiments that have demonstrated a link between rapid measurement of clipping volume and the clipping yield. Clipping yield is typically expressed as dry weight per area. Links to the articles discussed are in the blog post. Blog post on Converting Clipping Volume to Dry Weight: https://www.asianturfgrass.com/post/converting-clipping-volume-to-dry-weight/ Read mo...

Leah Brilman, Ph. D., is the Director of Product Management & Technical Services for Seed Research by DLF. We discussed velvet bentgrass, creeping bentgrass, and browntop bentgrass, along with seed production and grass performance. The bentgrass posts at the ATC website are at this link: https://www.asianturfgrass.com/tag/bentgrass/ To see the word cloud with all the most frequent tagged topic...