Soil tests

We provide soil testing services for clients around the world through Brookside Labs, and have an active research program in the area of turfgrass nutrition, soil and plant analysis, and sampling methods.


Measure exact topdressing effect, and requirement, by checking total organic matter by depth.

You won't believe this common maintenance practice doesn't reduce organic matter at all

Hollow-tine aerification, coring, core aeration, whatever you call it, removes organic matter from the soil. But if you measure the soil organic matter before pulling any cores, and then measure again after the cores are removed, the soil organic matter % will be exactly the same.

ATC newsletter survey results: future video topics

In the last ATC update newsletter I included a survey about future video topics. These are the results. Thanks to everyone for the feedback! A topic that has been on my mind and that I want to explain further is N fertilizer and ClipVol.

Flying Blind: the episode you've been waiting for

You’ve seen the trailer and heard the bleeps. Now, you can watch the full episode. This is “Flying Blind”, Episode 3 in Season 1 of my Grammar of Greenkeeping show.

Thai GCSA seminar: improving playing conditions and optimizing work efficiency

Today I gave a seminar at the Thai GCSA meeting. Photo by Boy Yothin These are the slides in Thai. And these are the slides in English.

The Flying Blind trailer: 8 things to know, measure, and adjust

Filming is complete for episode 3 of ATC’s Grammar of Greenkeeping show and the trailer came out today. This film had been scheduled to debut at an AGIF webinar this month.

7 things I've learned about turfgrass around the world

The day has finally arrived! I had a great time making this movie. I’ve been fortunate to have many friends around the world who have taught me a lot, and I spoke with some of them in this video.

A Tale of Two Tests

This post takes a few minutes to read because it covers this topic in a bit of detail. The summary is, I make use of two types of soil organic matter tests for turfgrass, these tests measure two different things, both important, and I recommend turfgrass managers measure both of these, ideally once a year.

Organic matter separation from turfgrass soil samples

I collected a lot of soil samples this month. My standard procedure after collecting samples is to air dry them before sending to the lab. This is a dried sample from the top 2 cm (0.