This pic is my test/control lawn. It receives only GMS and Gypsum for feeding.
It's 30k, receives 1gal GMS per acre 3x a year and 10lbs of Gypsum per/K in the fall. No granular fertilizer at all. It's mostley tall fescue with a bit of KBG in the back yard.
"To be intelligent is to be open-minded, active, memoried, and persistently experimental." Leopold Stein
"Democracy will cease to exist when you take away from those who are willing to work and give to those who would not." Thomas Jefferson