The Doublecut with Micah Woods

T-Jay Creamer joined me to discuss bentgrass & Poa annua (bent-Poa) management with a surprisingly low annual N rate, almost no use of PGRs, and no aeration (other than occasional needle tining) for more than two years. The results surprise me, and they may surprise you too.

We discussed this blog post about the turf speedo: https://www.asianturfgrass.com/post/turf-speedo-looks-like-this/

Follow T-Jay on X at https://x.com/TJayC17

• 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

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 explain why, when measuring #ClipVol, you will get value from annual totals too.

1. P & Poa with Bob Raley is this post https://www.asianturfgrass.com/post/no-poa-after-16-years/ and this video https://youtu.be/s90tIstilbw
2. The time component of #MLSN post is https://www.asianturfgrass.com/post/the-time-component-of-soil-test-interpretation/
3. The annual clipping yield post is https://www.asianturfgrass.com/post/the-annual-and-year-to-date-yield/ and links to this video https://youtu.be/8DdekceL9jE

• 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

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-some-greens/

You can see my slides and handout from the Palmetto GCSA Education Meeting at this link: https://www.asianturfgrass.com/seminar/palmetto-2024/

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

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 grasses at Pebble Beach is: https://www.asianturfgrass.com/post/flights-turf-photos/
We discussed EPA ecoregion maps, which you can read more about at https://www.epa.gov/eco-research/ecoregions and can see the especially detailed ones at https://www.epa.gov/eco-research/level-iii-and-iv-ecoregions-continental-united-states
The original MLSN guidelines, first presented at the Bouyoucos Conference in 2012, are available at: https://www.paceturf.org/PTRI/Documents/201408_stowell_woods_mlsn.pdf
MLSN calculations for micronutrients are here: https://www.paceturf.org/memberedition/mlsn-for-micronutrients
The Carrow et al. article from 2004 on SLAN ranges is available at https://www.files.asianturfgrass.com/clarify3.pdf
Soil test lab tour at Brookside Labs: https://youtu.be/PyL2bfdiBdE

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/

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-example-of-ample-dli/

The USGA Green Section Record with the fine podcast, frost research, Pat Jones article, and much more: https://www.asianturfgrass.com/post/breaking-the-ice/

The  @TurfgrassEpistemology  episode with Travis Shaddox on K and soil testing: https://www.youtube.com/live/aSZwz75aIig?si=Ip9JcBo41Poy_Ras

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

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/post/light-and-gp-again/

This calculator finds full sun PPFD and DLI for any location on any date: https://asianturfgrass.shinyapps.io/ppfd_by_time/

Park Nobel's environmental productivity index is described in this article: https://esajournals.onlinelibrary.wiley.com/doi/abs/10.2307/1938497

It's also mentioned in his text book Physiochemical and Environmental Plant Physiology: https://www.sciencedirect.com/book/9780128191460/physicochemical-and-environmental-plant-physiology

Travis Shaddox's Turfgrass Epistemology channel: https://www.youtube.com/@TurfgrassEpistemology

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

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 decision-making tools at https://www.paceturf.org/, this episode's sponsor.

Blog posts discussed include:

• https://www.asianturfgrass.com/post/new-om246-video-script/ which corresponds with this video https://youtu.be/Tc8dcBBt1zc
• https://www.asianturfgrass.com/post/nutrient-harvest-turf-math/
• https://www.asianturfgrass.com/post/testing-mlsn/
• https://www.asianturfgrass.com/post/couple-problems-with-year-round-soil-nutrient-analysis/
• https://www.asianturfgrass.com/post/five-down-one-to-go/

• Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
• Get ATC newsletters at https://www.asianturfgrass.com/newsletter/
• PACE Turf YouTube channel at https://www.youtube.com/user/paceturf
• ATC's YouTube channel at https://www.youtube.com/asianturfgrasscenter

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 from clippings, and how to systematically adjust N rate based on turfgrass growth ratio: https://www.asianturfgrass.com/post/growth-ratio-nitrogen-harvest-and-fertilizer-adjustment/

Adam's website is https://www.moellerconsultingllc.com/

He posted this chart on X showing a particle size distribution curve: https://x.com/AdamMoeller/status/1756301012392960446

Here's another example of a curve from the PACE Turf gallery: https://www.paceturf.org/gallery/detail/s-curve-with-sand-particle-size-of-topdressing-sand-and-om2-sand

We discussed the 2016 article with Todd Lowe on Managing Organic Matter in Putting Greens and the sand topdressing recommendations in that article: https://gsrpdf.lib.msu.edu/?file=/article/moeller-lowe-managing-11-4-16.pdf

• 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

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/composite-samples-1/

Brian's article on turf testing techniques from GCM magazine: https://www.gcmonline.com/course/maintenance/news/turf-testing-techniques

Read more about all kinds of turfgrass topics at https://www.asianturfgrass.com/
Get ATC newsletters at https://subscribepage.com/atc_newsletters
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/

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-the-next-frontier-in-fertilization/

Original article from Crops & Soils: https://doi.org/10.2134/cs2018.51.0307

My calculation of how much carbon is in the soil: https://www.asianturfgrass.com/post/how-much-carbon-and-humus-are-in-the-soil/

Dr. Carrow's calculations of humic material in the soil: https://www.asianturfgrass.com/post/asking-the-right-questions/

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