I spent a morning with Brad Revill at Nikanti GC final month. I needed to see the course, get some measurements, see the clipping quantity measurement, and speak about turf administration with Brad. Try his weblog for details about the revolutionary strategies he’s been utilizing.
I’ve now had an opportunity to work by a number of the measurements made that day, and one of the best ways I can assume to clarify them is in an inventory of numerical notes.
Clegg, Trufirm, and TDR-350
I introduced my Clegg—the SDI golf course firmness tester with a 500 g domed-head hammer—and measured floor hardness on three greens.
Instruments for measuring floor hardness of golf course placing greens.
Brad used a Spectrum Trufirm to measure floor hardness on those self same spots, and we additionally used a Spectrum TDR-350 to measure the volumetric water content material (with 7.6 cm rods) on those self same spots.
In earlier side-by-side measurements, I’ve not gotten very shut correlation between the Clegg and the Trufirm. That’s what we noticed in our measurements too.
In these three charts you’ll see two issues that make sense, and one which doesn’t. Beginning within the panel at far left, discover how the Trufirm studying goes down with the Clegg studying goes up. That’s what is anticipated. Each units are measuring floor hardness. With the Clegg, the floor is firmer (tougher) when the quantity will get bigger. With the Trufirm, the measurement goes in the wrong way—a smaller quantity means the floor is firmer and a ball gained’t make such a deep indentation. A bigger quantity on the Trufirm means the floor is softer and a ball indentation can be deeper.
The middle panel exhibits the Clegg measurements in comparison with the volumetric water content material. That is additionally as anticipated. When there’s extra water within the soil, the floor tends to be softer.
The panel at proper exhibits one thing that doesn’t make a lot sense. Among the softest Trufirm readings have been on the driest soil water content material, and a number of the firmest readings have been on the wettest.
Listed below are some abstract factors about this:
The inexperienced surfaces have been a bit comfortable, with these measurements taken 4 days after a solid-tine venting therapy.
The sort of poor correlation is anticipated when measuring intensively maintainted turf on the similar property, as a result of the surfaces are basically all in the identical situation. The place one may get higher correlation could be say at a property the place there have been localized dry spots all around the greens and soil moisture content material ranged from 5 to 30%. In that case, the place the floor situations range tremendously, then one would see higher coreelation.
The Clegg is best
In comparison with all the opposite instruments for measuring floor hardness, I discover the Clegg simpler (quicker) to make use of. That’s essential. I additionally discover it to provide extra correct outcomes. That’s essential too. I’ve written earlier than about my desire for the Clegg.
The measurements Brad and I took additionally present how with only some measurements, the Clegg can decide up on delicate and actual adjustments in situations. One of many greens we measured was the 6th. This inexperienced is within the open, with loads of mild and air motion, and usually is the healthiest inexperienced on the property. Due to that, it additionally has the very best soil natural matter content material. In latest OM246 exams, the 6th inexperienced had 9% extra natural matter within the prime 2 cm than the typical of different greens examined.
The 6th inexperienced at Nikanti GC
We measured floor hardness and soil moisture on three greens—this one, the 6th, and likewise greens 2 and 12. Inexperienced 6 was the softest. It additionally had the very best water content material.
The common Clegg on inexperienced 6 was 5% softer than the typical of the opposite greens. The Trufirm couldn’t detect a distinction, due to the extra variation within the Trufirm measurements.
The common water content material on inexperienced 6 was 25% larger than the typical of the opposite greens.
OM246 knowledge are actually helpful
I’ve been suggesting to anybody who will pay attention that there’s super worth in measuring whole natural matter by depth—what I name OM246. Brad has been arranging this testing at Nikanti for four years now. Not solely does this assist to optimize the cultural practices associated to disruptive practices like sand topdressing and scarification and coring, however it’s associated to playability as effectively (see earlier part).
A tiny ClipVol bucket
Brad has been measuring clippings at Nikanti and has shared loads of the information with me. We’ve additionally been engaged on a analysis undertaking to have the ability to predict the dry weight of clippings from the clipping quantity. Whereas we’ve shared numerous knowledge and pictures, this was my first probability to get to Nikanti to see how the clippings are measured there. It’s a tiny little bucket they use.
A 1 L bucket works when there aren’t that many clippings.
Greater than two birds
Much more. I used to be impressed in any respect the birds I noticed and heard in only a few hours at Nikanti. Two of my favourite birds to see in Thailand are the Asian openbill and the Asian golden weaver.
These reeds are stuffed with golden weaver nests.