climate

Year to date rain, and bermudagrass quality

Yesterday I wrote that bermudagrass fairways in Thailand wouldn’t be as good as they are in the Algarve because of climate differences. The cumulative rain so far this year makes a nice illustration of this.

Warm-season grass, autumn temperatures, and winter overseeding

The turfgrass growth potential (GP) is a number that represents the proximity of the actual temperature to the optimum temperatures for growth. GP is used for a lot of things. One can use it to make estimates of nutrient use, estimates of topdressing amounts, and to find the time in autumn when the cool-season growth potential starts to exceed the warm-season growth potential.

Is it normal to be cloudy like this?

On 17 July 2016, I was in the Tokyo area with Jim Brosnan. The daily light integral (DLI) in Tokyo that day was 14.2 mol/m2. Jim asked me if it was exceptionally cloudy that day.

GP and GDD: are they comparable?

Someone asked me at the Northern Green Expo if the temperature-based growth potential (GP) and temperature-based growing degree days (GDD) are comparable. They sort of are, with a couple of exceptions.

A summary of photosynthetically active radiation for 1 year at Tokyo

This chart (download at full size) shows the average photosynthetic photon flux density (PPFD) for each hour of 2015 at Tokyo. The daily light integral (DLI) is the number written in black at the top right corner of each facet in this chart.

Estimating daily light integral (DLI) in Tennessee

After I wrote about no problem DLI levels, Brandon Horvath asked if I could get DLI for some cities in Tennessee. For a description of how I made the calculations, see Estimating daily light integral (DLI) in 4 Tennessee cities.

A DLI Index

I’ve shown the sum of the mean daily temperature over 2014 for four locations: Fukuoka and Tokyo in Japan, Holly Springs in Mississippi, and Watkinsville in Georgia. Fukuoka had the highest accumulated temperature, then Tokyo, then Watkinsville, and the coolest of those four locations was Holly Springs.

Zoysia on putting greens? Why?

Korai green on the 18th at Keya GC during the 2014 KBC Augusta tournament. Why would one deliberately use manilagrass (Zoysia matrella, or korai in Japan) on golf course putting greens?

A number between 0 and 1: using the turfgrass growth potential

Every turf manager knows that temperature has a huge influence on the growth rate of the grass. Consequently, mowing, fertilizing, overseeding, winter dormancy, heat stress of cool season grasses, and much more are all directly influenced by temperature.

Not the usual everyday maintenance

This isn’t the usual everyday maintenance, unless one is in Japan, in which case these things are routine. On an early autumn visit to Ryugasaki Country Club, I had a chance to observe some of the maintenance work, and I thought it would be interesting to share a few things I saw that are common on Japanese golf courses and less common elsewhere.