All Episodes
Displaying 61 - 90 of 169 in total
Using turf math, mg/kg, ppm, and fertilizer rates, with Bjarni Hannesson
Bjarni Hannesson joined me to discuss parts per million (ppm) and how that measure of nutrients in the soil can be expressed as a fertilizer rate, and vice versa. This...
Does a location exist with 365 days a year of high GP for cool-season grass?
The temperature-based growth potential, developed by PACE Turf, transforms the average air temperature to a growth potential (GP). The GP is conveniently scaled from 0...
"Blown away by the quality" of turfgrass by a simple method of adjusting N fertilizer
An anonymous golf course superintendent wrote that they were "blown away by the quality of these surfaces with an amount of nitrogen I would’ve thought was far too sma...
A daily tournament diary from the 2023 KBC Augusta golf tournament in Japan
I spent nine days at the KBC Augusta golf tournament in 2023. In this episode, I introduce the blog post with the daily diary of my observations and measurements durin...
Reflections on a July with record heat and drought
Andrew McDaniel and I worked together at Habu CC in July 2001. We also worked together at the 50th KBC Augusta tournament in August 2023. I reflect on, and discuss, bo...
Green firmness measurements after using a 4 ton roller (it actually didn't firm the surface much)
Andrew McDaniel joined me from the Keya GC maintenance office to discuss firmness measurements of putting greens, using a 4 ton roller on the greens, and why the green...
Tournament golf and zoysia greens are a fascinating combination
I recorded this from Keya Golf Club, which will host the 50th KBC Augusta golf tournament on korai (Zoysia matrella) putting greens this week. I explained why I find t...
The growth ratio for consistent growth and nitrogen fertilizer adjustment with Jason Haines
Jason Haines joined me for another #TurfMath episode to explain what the growth ratio is, how he uses it, and how he calibrates it. See this post for the equation and ...
Turf Math with Bjarni Hannesson and Jason Haines
We discussed the ease of metric units and the utility of knowing some key numbers in turfgrass maintenance.We discussed this post: https://www.asianturfgrass.com/post/...
Using morning and afternoon VWC measurements to find the site specific crop coefficient #TurfHacks
One of the things you can do when you are able to express soil water content as a depth of water, and vice versa, is to express the water loss rate from the soil divid...
A soil water content turf hack
For as long as I can remember, I've used the easy 1 mm = 1 L = 1% soil volumetric water content (VWC) relationship when converting between water use by grass, ET, irri...
I prefer sand topdressing amounts expressed as a depth
I gave three reasons for my preference that sand topdressing amounts be expressed as a depth. One is consistency and standardization. Depth means the area to which the...
Golf in Japan: maintenance staff numbers, rounds played, number of holes, and annual N rates
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 equ...
Grass gets this much PAR light in full sun (no clouds)
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 w...
Coring three times a year with half-inch tines on bentgrass putting greens
A research article recommended two spring and one autumn hollow-tine aerification, supplemented by solid-tine aerification during summer, for creeping bentgrass puttin...
The shade effect of clouds, photosynthetically active radiation, and 2 PAR apps
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...
It's tough to manage cool-season putting greens when ΔGP is less than 0
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 gro...
Transition zone putting greens, light, speed, zoysia, bermuda, and bentgrass with Mike Richardson
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 tr...
Reflections on growth rate, nitrogen, and disruption, with Chris Tritabaugh
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 a...
A soil test extravaganza
This episode discusses three recent posts about soil testing (soil nutrient analyses), from what happens at the lab, to micronutrient test results.- Brookside Lab vide...
Blog post bombs of 2020 with The Talking Greenkeeper
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, pho...
Terminology of turfgrass soils: total organic material (#OM246) and soil organic matter (SOM) with Brian Whitlark
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 org...
Potassium fertilizer could increase dandelions by 20x
Dandelion (Taraxacum officinale) abundance can be increased by potassium (K) and lime applications. Adding K fertilizer when it is not needed by the grass, or adding l...
Using the standard growth potential (GP) equation allows direct comparisons from site to site
I used to tell people that GP is just a number, and if they wanted to modify it to fit the way grass grows at their location, then go ahead and do so. I don't say that...
Is nitrogen rate connected to surface area disruption?
March in Japan is the start of cherry blossom season, and on golf courses there is a lot of aerification. I've noticed that golf courses in Japan generally don't do as...
All about the growth ratio equation for temperature-adjusted #ClipVol
I explained what the growth ratio is and showed the equation used to calculate growth ratio. This simple equation takes the measured clipping volume and adjusts it by ...
Growth ratio to predict clipping volume for any time of year
One of the common questions about #ClipVol is "what is a normal amount of clippings to get?" By using the growth ratio, it's possible to account for the temperature co...
Turfgrass growth rate and plant growth regulators with Bill Kreuser
Bill Kreuser joined to answer all the questions I could think of related to plant growth regulators (PGR). We discussed re-application intervals based on growing degre...
Cool-season turfgrass growth potential in Augusta in April and in November
In 2020, I looked at the temperatures in Augusta during the April Masters Tournament week, and the temperatures in November during the re-scheduled Masters dates. From...
The USGA's GS3 for measuring putting green performance with Scott Mingay and Jordan Booth
I spoke with Scott Mingay and Jordan Booth from the USGA about the GS3 tool that measures green speed, smoothness and trueness of ball roll, and surface hardness of go...