I don't have a lot of experience but from what I've seen you can't give the best results without being able to blanket spray post emergent herbicides. I did the same thing last year- granular pre and fert with spot spraying. By the time the weeds I could see and spot sprayed died out every thing I couldn't see was becoming visible.
Tractor supply has a 25 gallon sprayer with a boom that is made to mount on a four wheeler. I'm gonna mount it to the front of my 40" toro grand stand. $400 for the sprayer.
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