The Doublecut with Micah Woods

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 with "landing gear" and the 126 hole facility are in this post: https://www.asianturfgrass.com/post/rolling-japan-golf-best-zoysia-course-in-world/
More information about the International Turfgrass Society and the July 2025 International Turfgrass Research Conference in Japan at https://turfsociety.com/

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/

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/ppfd_by_time/

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/

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/

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/

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 allow you to either check the full sun instantaneous PAR, the full sun daily PAR, or the past year of PAR, for pretty much anywhere in the world: https://www.asianturfgrass.com/post/shade-effect-of-clouds/

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/

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 total organic material. 

These posts were discussed:

• Delta GP and summer of 2022: https://www.asianturfgrass.com/post/last-summer-at-36-locations/
• Best time to soil sample: https://www.asianturfgrass.com/post/best-time-of-year-to-soil-sample/
• Tritabaugh, Rossi, and Park Grass: https://www.asianturfgrass.com/post/distracting-us-from-the-real-challenges/
• All about OM246 testing and the different procedures at the lab: https://www.asianturfgrass.com/post/all-about-om246/

• 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/

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 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/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 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=share
ATC Doublecut about organic matter and organic material terminology with Brian Whitlark: https://youtu.be/tMfby5xR2IM
Chris 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/glr2.12024

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/

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_email
To get on the ATC soil test email list, sign up here: https://subscribepage.com/soil

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/

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.

1. To get the ATC blog by email: https://subscribepage.com/atc_blog_email
2. We discussed this post: https://www.asianturfgrass.com/post/ten-posts-no-one-read-last-year/
3. The Talking Greenkeeper podcast: https://podcasts.apple.com/us/podcast/the-talking-greenkeeper/id1435947281
4. Follow Joe Gulotti on Twitter: https://twitter.com/hardg43
5. We discussed a recent ATC Office Hours with Richard Forsyth: https://www.youtube.com/live/T-w6CQzGzKc?feature=share
6. And a recent ATC Doublecut with Brian Whitlark: https://youtu.be/tMfby5xR2IM
7. 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.

1. 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/
2. You can see how a soil sample is tested in this video from Brookside Labs https://youtu.be/PyL2bfdiBdE
3. 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/