In article ,
Kurt Ullman wrote:

I have this little patch of land that backs up to my lot that was deeded
to me recently. I have a few areas that I want to plant "regular" grass
instead of the stuff that planted itself when it was still farm field. I
have hoed the area that I am planting this time to bare ground. I am
trying to decide if I just want to go ahead and plant the new grass or
if I should nuke the area with Roundup and then wait about 4 weeks
before I start on the grass. Any suggestions?

If you till the soil once, then let seedlings sprout, and till again,
all plant matter will be dead and you won't have to use roundup. Any new
unwanted growth will be from seeds that blow in from other areas, and
roundup will have no effect on that process anyway.