I Killed a lawn on Labor Day with Roundup. 2 weeks later thatched 5times,raked up, aerated and seeded (KB/Rye/Fescue mix).Only achieved about 50% density by November.Limed again in February,barely 6.0 in places.April 15 this year,gave a light application of starter fert. and overseeded at the original rate.Didn't apply any herbicide,wanted to give the seed a chance. Any suggestions on weed control from here on out? Lawn had major goosegrass problem when I got to it last year.