How to question on costal hay

I have a question for y'all. I got a hay field on a lease and it didn't get baled or fertilized at all last year. Still has some pretty good costal stands, but also has a lot of weeds and flowers. North Texas area. My question is should I spray with pastora, or fertilize first? I am worried if I spray first that there will be large areas of bare spots that the owner may not like. Is there something else I should spray with? or get the fertilizer on first then spray after the costal has got a better stand, then cut it for cow hay?

How to question on costal hay