Water

Soil water content turf hacks

An easy way to relate inches of irrigation or inches of evapotranspiration (ET) to changes in volumetric soil water content (VWC)—that is something I could never figure out.

Why I don't worry about infiltration rate

I understand there are a lot of different ways to manage grass. One way involves measuring infiltration rate. That’s not the way I do it. There are eight things1 I do like to measure.

5 examples of Goodhart's law in turfgrass management

When a measure becomes a target, it ceases to be a good measure. That’s a generalization of Goodhart’s law. I’m an advocate of measuring some surface performance, plant, and soil parameters.

Bermudagrass, zoysiagrass, and water use

I was talking with a golf course designer recently, and he mentioned that “zoysia starts to look pretty attractive because of its lower water use.” That led to a long conversation about how incorrect that statement is.

Big differences between species

Yesterday I took a walk around a golf course in Chonburi, Thailand. It is three months into the dry season at this location; there has been negligible rainfall in Chonburi since the start of November.

Post-rain growth flush from nitrogen in the rain or nitrogen from the soil

The other day it rained at ATC南店. I knew that the grasses would grow at a faster rate after the rain than they had been growing prior to the rain.

Can you spot the grass that did not get enough water?

One of the most interesting articles I read last year was Drought responses of above-ground and below-ground characteristics in warm-season turfgrass by Zhang et al. That article describes the drought response after 3 weeks with irrigation withheld:

Drought, bermudagrass, and zoysiagrass

There’s an interesting article by Zhang et al. about warm-season grass and what happened under water scarce conditions during 21 day dry down periods. This article, Drought responses of above-ground and below-ground characteristics in warm-season turfgrass, reports on an experiment in which bermudagrass (Cynodon dactylon), manilagrass (Zoysia matrella), Japanese lawngrass (Zoysia japonica), and St.

Four reasons zoysia should be a poor choice for California

I’ve been asked about zoysia suitability for California, particularly northern parts of California, many times. Every time, I give the same answer. In such a relatively cool climate, and in such a relatively sunny and dry climate, Cynodon seems like a much better choice.

After 17 inches of rain, how much K leached?

When I was at Keya GC last month for the Japan Amateur Championship, it rained a lot. From June 29 to July 8, there was precipitation every day, and the total was 446 mm, or 17.