Twice the growth at a different mowing height

Bill Kreuser shared a fascinating update from one of the experiments he is conducting this summer. I wouldn’t have expected to see such a big difference in growth rate with a mowing height difference of 0.

Putting green speed, surface hardness, and clipping volume

Last week I had a couple conversations about green speed. Green speed and surface hardness My column in the June 2018 issue of Golf Course Seminar magazine discusses the relationship between effective mowing height and green speed.

Of conventional mowers, electric mowers, and electricity generation

Yesterday I responded to two questions related to carbon emissions associated with electricity generation. This was part of a broader discussion started by Jason Haines about small electric autonomous mowers.

Autonomous mower at 12 mm produced higher quality turf, increased shoot density, and reduced energy use compared to a conventional reel mower

Jason Haines has written recently about The future of robot mowers today and I recommend having a read of that post for more insight, and some videos of these types of machines.

Some rise, some fall, some climb

A full year of putting green clipping volume measurements looks like this. Well, it’s like that with a number of caveats. This is what it looked like: at this location 21° N latitude with seashore paspalum turf managed the way it was with the weather of the past year growing in the soil conditions of this site irrigated with this water etc.

Turf around the world, with a couple maps

When I led a seminar in Idaho last month about Turf Around the World, I wanted to show a map of the flights I’d taken this year. I didn’t have a map to show then, however, because of some software problems.

Green speed ridgeline plot and the work to produce these conditions

Here are data from 903 measurements I’ve made from 2011 to early 2021 excluding all tournament measurements. Table 1: Number of measurements and median green speed in feet, by species. Data from 867 stimpmeter readings by Micah Woods excluding tournament measurements.

Sward stimpmeter speed for seven species

Golf course putting greens are covered with many types of grasses. I’ve written about my skepticism that adding Si will increase green speed in 3 posts on the blog (post 1, post 2, post 3), and I’ve done so in reference to Zoysia matrella greens which are known for the high silica content of the leaves.

This will make you rethink what you throw in the spray tank

Beth Guertal wrote to me a couple weeks ago: “I liked your Si blog post of recent date. It made me go back and find some data I collected once upon a while.

3 reasons sheep are better than cows for mowing fairways

The 1st at Ootacamund Gymkhana Club (founded 1896) is strikingly reminiscent of the 10th at Augusta National. This long dogleg left plays steeply downhill in a wide corridor between tall evergreen trees.