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 Speaking episode with Norm Hummel that covers fine sands and coefficient of uniformity: https://www.turfnet.com/podcasts/rossi/hummel2/
• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/

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 topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/

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.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/

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/weather
- https://www.paceturf.org/gallery/detail/photosynthetically-active-radiation
- https://www.asianturfgrass.com/post/rule-of-thumb-for-cloud-effect-on-par/

Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
Find a suite of decision-making tools at https://www.paceturf.org/
Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/

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.org/content/usga/home-page/course-care/green_section_record.htm
• the golf course shown with the Eiffel Tower view is Golf de Saint-Cloud, https://www.golfdesaintcloud.com/
• blog post about GvX and Chris Tritabaugh quote: https://www.asianturfgrass.com/post/any-kind-anywhere-any-level/
•  GvX post about zero-handling problem: https://www.asianturfgrass.com/post/gvx-clippings/
•  the SI calculator for soil test levels at any probability https://asianturfgrass.shinyapps.io/turfsi/https://www.asianturfgrass.com/post/gvx-clippings/
•  OM246 example reports with tables of normal values by species https://www.asianturfgrass.com/project/om246/
•  the GSS summary article https://doi.org/10.17605/OSF.IO/RG49P
•  how much OM is too much https://www.asianturfgrass.com/post/how-much-om-is-too-much/
• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/

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/
• All posts tagged "growth potential:" https://www.asianturfgrass.com/tag/growth-potential/
• Connect with Geoff on LinkedIn (https://www.linkedin.com/in/geoff-fenn-aa2ba242/) or X (https://x.com/Geoff_Fenn)
• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/

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 the central tendency (average) for soil nutrient data: https://www.asianturfgrass.com/post/geometric-mean-as-central-tendency-for-soil-nutrient-data/

• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/

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 more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/

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/relationship-between-soil-water-and-turfgrass-surface-hardness/
• https://www.asianturfgrass.com/tag/surface-hardness/

• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/
• Listen to the ATC podcast network https://podcasts.asianturfgrass.com/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/

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 https://youtu.be/mRJcEhOyxPA
• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Find a suite of decision-making tools at https://www.paceturf.org/
• Get free ATC newsletters at https://www.asianturfgrass.com/newsletter/

• Turf Without Borders show page: https://turfwb.asianturfgrass.com/
• International Turfgrass Society: https://turfsociety.com/