Coordinating fertilizing with weed spraying.

So I have all my first cutting done and either sold, in barns or stored outside for the low quality stuff.
Fields are 12-18" already as we've had more rain than one could imagine.
Weeds are coming up, too.
I'm thinking 2nd cutting will be early this year, maybe mid August. I have a buyer who will buy any decent or better hay I have. They need so much that I can't make enough. I thought if I fertilize again (done in April already) I could supplement my tonnage.

Should I spray now (planning on 24D and Cimmaron) to kill weeds at younger stage, then fertilize in about mid July? Or would that be a bad plan? Would think it'd be stupid to fertilize everything (weeds and grasses) then try to spray the weeds later, they'd just be stronger from fertilizing. Of course, spraying reduces tonnage, too
Would like the option to be able to spray twice if necessary as weeds arrive at all different times. Seeing horse nettle, dogbane, bedstraw, etc.
What do you do that has worked for you in the past?

Coordinating fertilizing with weed spraying.