The major selling point for Sharpen..is the ability to plant immediately after application. Most 2,4-D ester labels call for a 7 day period between application and planting at the 1 pint rate. This is more important in soybeans than corn..although a real gully washer after application on corn will wash enough into the soil to damage it too. The thing is..if you don't get any..or aren't expecting any rain for a week...the 2,4-D won't hurt anything if you plant immediately after spraying. It's all a function of the chemical company wanting to be completely safe when printing their label. Sharpen plus 2,4-D will probably tear down bigger giant ragweed..and maybe some pokeweed or milkweed. But if you want something to really give you some more burndown..put a .25 lb.-.5 lb. of metribuzin with it. You'll get some small seeded broadleaf residual...and the burndown will approximate Gramoxone.
