When the cool-season growth potential (GP) is lower than the warm-season GP, the difference between them (the ΔGP) will be negative. In this episode, I discuss ΔGP and three different ways to think of summer duration.

I discussed this blog post: https://www.asianturfgrass.com/post/summer-assessment-with-delta-gp/

Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
Get ATC newsletters at https://www.asianturfgrass.com/newsletter/
Turfgrass information and decision-making tools at https://www.paceturf.org/
PACE Turf YouTube channel at https://www.youtube.com/user/paceturf
ATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter

If you'd like to attend the 15th International Turfgrass Research Conference in Japan, here's a direct link to the conference website: https://itrc2025.turfsociety.com/

If you'd like to attend the 15th International Turfgrass Research Conference in Japan, here's a direct link to the conference website: https://itrc2025.turfsociety.com/

I wondered what NotebookLM could do, so I created a couple notebooks. One has the title “Global Soil Survey,” and in that notebook I uploaded articles and documents I’ve written about MLSN and the GSS. I let the model generate a few different audio summaries of this project. And I uploaded the text to A Short Grammar of Greenkeeping, and I let the model produce an audio summary of that book.

• Blog post: https://www.asianturfgrass.com/post/grammar-greenkeeping-turfgrass-growth-optimal-playing-surfaces/
• Google's NotebookLM
• Global Soil Survey
• MLSN cheat sheet
• PACE Turf

If you'd like to attend the 15th International Turfgrass Research Conference in Japan, here's a direct link to the conference website: https://itrc2025.turfsociety.com/

Grant Saunders is the course superintendent at Hamilton Golf Club in New Zealand. He has successfully overseen a green species conversion from Poa annua to browntop bentgrass (Agrostis capillaris). We discussed that, and the role of OM testing, and sand topdressing, and soil pH, and greenkeeping in New Zealand.

Some links include:

• https://www.asianturfgrass.com/post/accumulation-soil-organic-material/
• https://hamiltongcmaintenance.blogspot.com/2018/06/poa-vs-browntop.html
• A "Cart Rides with Micah" episode from Hamilton Golf Club https://youtu.be/dWj-MO4UBW4?si=oF-rtC_BWTPEYZmB
• https://www.asianturfgrass.com/post/gp-as-proxy-for-season-length/
• https://www.asianturfgrass.com/post/new-mlsn-cheat-sheet/

• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Get ATC newsletters at https://www.asianturfgrass.com/newsletter/
• Turfgrass information and decision-making tools at https://www.paceturf.org/
• PACE Turf YouTube channel at https://www.youtube.com/user/paceturf
• ATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter

If you'd like to attend the 15th International Turfgrass Research Conference in Japan, here's a direct link to the conference website: https://itrc2025.turfsociety.com/

When you know the rate at which organic material is accumulating in the rootzone, you can adjust sand topdressing rates with more precision. You can also start to check how any changes in maintenance can have an effect on the accumulation rate.

The blog post discussed is this one: https://www.asianturfgrass.com/post/inexorable-rise-soil-organic-matter/

The Shiny app to calculate the accumulation rate is: https://asianturfgrass.shinyapps.io/om246/

You can learn all about OM246 tests at https://www.asianturfgrass.com/project/om246/

Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
Get ATC newsletters at https://www.asianturfgrass.com/newsletter/
Turfgrass information and decision-making tools at https://www.paceturf.org/
PACE Turf YouTube channel at https://www.youtube.com/user/paceturf
ATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter

If you'd like to attend the 15th International Turfgrass Research Conference in Japan, here's a direct link to the conference website: https://itrc2025.turfsociety.com/

T-Jay Creamer is the golf course superintendent at Olympic View Golf Club in western Canada. He joined me to discuss tournament golf maintenance and the grammar of greenkeeping.

We discussed this ATC blog post: https://www.asianturfgrass.com/post/two-weeks-in-august/
T-Jay's Substack newsletter is https://ovgrounds.substack.com/
He explained the green speed and smoothness annual summary in this post, discussed at the end of our podcast: https://ovgrounds.substack.com/p/chasing-the-numbers-2024-greens-speed
USGA video with Chris Tritabaugh about pinpoint precision at the U.S. Amateur https://youtu.be/FA9YLlKsdFE

Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
Get ATC newsletters at https://www.asianturfgrass.com/newsletter/
Turfgrass information and decision-making tools at https://www.paceturf.org/
PACE Turf YouTube channel at https://www.youtube.com/user/paceturf
ATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter

If you'd like to attend the 15th International Turfgrass Research Conference in Japan, here's a direct link to the conference website: https://itrc2025.turfsociety.com/

A month ago Joe Gulotti and I walked the fairways and greens of the Montchanin Course at Dupont Country Club. I wrote a blog post about that, and we discussed my visit in this episode.

Blog post: https://www.asianturfgrass.com/post/a-visit-to-the-talking-greenkeeper/
The Talking Greenkeeper podcast: https://podcasts.apple.com/us/podcast/the-talking-greenkeeper/id1435947281

Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
Get ATC newsletters at https://www.asianturfgrass.com/newsletter/
Turfgrass information and decision-making tools at https://www.paceturf.org/
PACE Turf YouTube channel at https://www.youtube.com/user/paceturf
ATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter
Listen to the ATC Doublecut with Micah Woods podcast at https://doublecut.asianturfgrass.com/
Listen to the ATC Office Hours podcast at https://office-hours.asianturfgrass.com/

If you'd like to attend the 15th International Turfgrass Research Conference in Japan, here's a direct link to the conference website: https://itrc2025.turfsociety.com/

You can sometimes, perhaps more often than you would think, find soil under good turf to have lower nutrient content than does soil under poor quality turf. In this episode, I explain why that is, what the implications of this phenomenon are, and what you can do about it.

• This blog post has all the details on the turf (and soil) paradox: https://www.asianturfgrass.com/post/turf-paradox/
• Henry Qu and I discussed learning, Bayesian analysis, and more in this engaging conversation: https://youtu.be/o4Y4xJt0stU?si=2jQevp6CqKPWR1gi

• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Get ATC newsletters at https://www.asianturfgrass.com/newsletter/
• Turfgrass information and decision-making tools at https://www.paceturf.org/
• PACE Turf YouTube channel at https://www.youtube.com/user/paceturf
• ATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter

If you'd like to attend the 15th International Turfgrass Research Conference in Japan, here's a direct link to the conference website: https://itrc2025.turfsociety.com/

Independent turfgrass researcher John Dempsey, Ph.D., joined me to discuss evaluating treatment effects and the importance of having a good control. We talked about diseases, nutrition, and this blog post:

https://www.asianturfgrass.com/post/problem-with-the-controls/

Find John on X at https://x.com/J_J_Dempsey

• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Get ATC newsletters at https://www.asianturfgrass.com/newsletter/
• Turfgrass information and decision-making tools at https://www.paceturf.org/
• PACE Turf YouTube channel at https://www.youtube.com/user/paceturf
• ATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter