Blog
New posts
Top posts
Topic list
Podcasts
ATC Doublecut with Micah Woods
ATC Office Hours
Soil tests
MLSN
OM246
Soil tests and other lab services
Projects
Article library
ClipVol
Shiny Apps
Turf project gallery
Newsletters
Seminar handouts
PACE Turf
About
About
Contact
Light
Dark
Automatic
OM246
A crash course in OM246 total organic matter testing
I put together a couple videos that discuss total organic material testing. First, this one, which shows some samples I’ve collected. From my office, to the post office, I discuss what is going to happen with them at the laboratory.
Micah Woods
2022-02-27
1 min read
What's normal for OM2
I’ve been trying to explain what’s normal, and in one of those explanations I ended up making these charts. I also separate those same data by species. In ATC’s report for OM246 tests (see a sample report with charts), I include charts and percentiles that show what is normal for the current test results, based on the most recently updated version of the dataset.
Micah Woods
2022-02-26
1 min read
Five comments about the ATC Office Hours on OM246
A colleague from Canada wrote to me with five comments after finishing this ATC Office Hours with Chris Tritabaugh (or listen as a podcast here). Just listened to your talk with Chris and wish I had the where about to attend it live, as I would have kept the chat room real busy!
Micah Woods
2022-01-18
8 min read
The Talking Greenkeeper podcast with Jason Haines
Joe Gulotti, host of The Talking Greenkeeper podcast, invited Jason Haines and I to join him for a fun conversation. We talked about sustainability, MLSN, OM246, playability, sand topdressing, and a special Christmas for Joe in Arizona.
Micah Woods
2021-12-22
1 min read
Organic matter variability between greens at the same site
Daniel Hahn asked an interesting question about organic matter. Talking about “variability between greens at the same site,” he wondered, “could you explain what your opinion is about the statement, if you think greens vary a lot in OM or if you see minor difference?
Micah Woods
2021-12-21
2 min read
Our Office Hour (actually 2.5 hours) discussion, summarized
Chris Tritabaugh and I met to review the OM246 test results from samples collected in October 2021 at Hazeltine National Golf Club. We did this as a livestream episode of ATC Office Hours, which is available for watching or listening at your leisure.
Micah Woods
2021-12-16
4 min read
Soil organic material by mass and by volume
Soil organic matter, and the total organic material measured by OM246 tests, are reported on a mass basis. That is, mass of organic matter per mass of soil. For convenience, this is usually reported as a percentage (%).
Micah Woods
2021-12-08
1 min read
Sand topdressing and surface layer organic matter
One of the things I’ve started looking at when doing OM246 reports is the combined OM in the top 6 cm (2.4 inches) of the rootzone. This shows the big picture of total organic material change at the surface of the rootzone.
Micah Woods
2021-10-28
2 min read
OM246 sampling instructions
I’ve written a lot about OM246 testing for total organic material by depth in the soil, and why I think this test is so useful. Something I hadn’t written, until this week, is my own set of sampling instructions.
Micah Woods
2021-10-14
1 min read
Sand and organic matter have different bulk densities
Organic material measurement by mass loss on ignition is reported on a mass basis. For OM246 testing, I prefer doing a burn at 440 °C.1 The equation for loss on ignition (LOI) as a percentage takes the mass of sample dried at 105 °C ($m_{105}$), subtracts the mass of the sample after burning at 440 °C ($m_{440}$), divides by the original mass, and multiplies that by 100.
Micah Woods
2021-10-03
6 min read
«
»
Cite
×