You spot spraying or broadcasting? I see a local guy out in his field all of the time. My valley is the biggest producer of "weed free" hay in the state. I think I mentioned that before.
Spot spraying. The beans are too tall to try running a tractor through now. It is not bad because I use a 12ft drill and leave about a 1ft space between. I spray about 2 acres a day after work. It will take time but thats all we have right. lol