Here are just a few quotes from the University of Florida IFAS Extension website.

"Potassium fertilization can help turfgrasses increase their tolerance to many stresses, including drought. Potassium promotes increased root growth and thicker cell walls."

"Turfgrasses require potassium in nearly the same amount as nitrogen, especially in sandy soils where both can readily leach out."

"Apply a balanced fertilizer containing equivalent amounts of potassium, preferably a slow-release potassium form."

"Understanding plant responses to nitrogen and potassium fertilization is helpful in developing a beneficial program as well as providing a well-balanced nutritional program.

Why is so much emphasis put on potassium here in FL? Any suggestion/ideas?

Here is a link that might be useful: UF-IFAS website