Hoss has pretty much covered it. If you wanted a more rapid kill then adding 2,4,D to the mix would hasten the process, but then you would have to thoroughly disk/till the soil because of the residual from the 2,4,D. If Rye is what you're planting, then sowing right after you spray would work, Glyphosate/Round-up will not affect seeds and no tilling/disking would be necessary. If the vegetation is very tall and thick, then waiting two weeks might be needed before mowing or tilling. No need to worry if rye is what you're planting, it grows very fast(will sprout in 4 days) and frost and soil temp has little effect on seedlings.
On a side note, I see an advertisement for Glyphosate in this thread..."as low as $9.25 a gallon"
I paid $47.50 a gallon back in the spring.
