Getting ready to nuke some nutsedge myself. I use Bayer nutsedge control - aka sulfentrazone.

It works like a champ

Last time I used it, it took out all of my hybrid bluegrass. Kind of nervous to spray it haha. Here's a novel idea, I'll try it on a small patch first.

Killing the nut is the key to killing nutgrass.

I don't broadcast it, just pump spray. It does discolor if you broadcast. It does supposedly transfer down to nutlets too & I've certainly seen a reduction in new patches since I started using it. I posted an article a few weeks ago from turfnet about it