climate

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.

Turfgrass growth is affected by temperature. The temperature-based turfgrass growth potential (GP) is an easy way to look at how the actual temperature is related to the optimum temperatures for growth.

I went for a run to the ocean at Cerro Gordo. As is my wont, I looked for grasses along the way. There were lots of zoysia lawns where I started.

I made [a Shiny app with climatological normals data][1] from the Japan Meteorological Agency to show the combination of sunshine and temperature at 11 locations. [@naturalgolf_D asked][2] “What kind of situation is Japan?

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.

I’ve shared some charts of photosynthetically active radiation (PAR) as it changes through the day and through the year at different locations. For example, this is the PAR at Corvallis for each day of 2015.

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.

I received this inquiry by email: When looking at water quantity for a new golf course, you have to determine how much water is needed obviously so what I want to know is

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.

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.