Johnson Grass

Well with all the continuous rain I haven't been able to get into the fields at all. I was able to take a batwing raised all the way up into about 30 ac and cut the tops of the weeds and Johnson grass before it went to seed. Those fields actually look pretty good! Unfortunately, we have 60 or so more ac that looks totally infested with this Sh!t and I don't know what to do. Should be willing to sacrifice the OG and Timothy to save Alfalfa? If so what should I do, cut and roll it to get it out of the field and spray Poast or Select and try to salvage 3rd cutting?? Thanks in advance.
Wayne

Johnson Grass