We have a heavier than normal flush of weeds in our corn and it looks like I will need to spray earlier than usual (the corn will be about 5"-6" tall) and will be using a different mix that includes metolachlor to get some residual on green foxtail and some clopyralid for thistle.  I have always added surfactant when spraying glyphosate on corn, but with all the "extras" in the tank I don't want to burn the corn.  We usually leave the surfactant out when spraying wheat with mixes that include EC's.

AMS 12.75 lbs/100
Atrazine 0.56 lbs
Mesotrione 3.0 oz
Clopyralid 4.0 oz
Metolachlor 22 oz
Glyphosate 40 oz