We never put Atrazine out until after the corn is in the ground, just in case.  We burn down with Fortitri (Sharpen, Outlook, and Zidua) and Roundup, then follow the planter with 30-0-0-2.5, Atrazine, and Asana.  We have better luck than when we ran Roundup, Dicamba, and Dual.  If needed we will add Paraquat in behind the planter if we get any green up or have escaped ryegrass and such.