Ditto - I use a 1% solution by volume and keep the ground speed so that I apply about the right amount of Glysophate to the area. It does take me 2 apps to keep the weeds clear. Usually at about 6" height and again around 2'. I do about 8 acres RR beans and 3 acres RR corn. I hit the corn only one time at about 1' height. I do not have a high platform sprayer. Beans don't get going all that well due to being hammered. Corn has made fine crops every season. I leave the corn standing and plant a green field around the corn. Works out pretty good for a while, but the ears are all gone more or less by early November.