Light

Is morning sun the most important for turf? It depends.

I used Storify to string together some related tweets and images over the past few years. That service is shutting down. I’ve moved a “story” about light, shade, and time of day to this Twitter moment.

"I really wish that I could hear this presentation"

That’s what Jon Scott wrote to me on October 7, 2014, after I shared the slides from my shade talk at the Northwest Turfgrass Association conference. We’ve been having a back and forth about this ever since.

GP is a number. It's explained here in photos and words.

Every now and then I get some questions about the temperature-based growth potential (GP). The most recent question was about relative humidity: “I am curious about the effect relative humidity has on growth potential?

40, 30, & 20

For warm-season grasses on putting greens, I propose a no-problem DLI of 40 for bermudagrass, 30 for seashore paspalum, and 20 for zoysia. Above that, and there is enough photosynthetically active radiation (PAR) to easily manage the species. Below that, and it won't be no problem anymore.

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.