Ouch, you guys are brutal. JohnBrowning, I hope you realize that generalizing that all farmers are pig headed and ignorant is as wrong as saying that all BITOGERs have OCD and are nerds.
I used to have a one sided opinion about truck drivers until I spent a few hours in my FIL's semi tractor and learned their perspective. Now, I understand their side of the situation and I am more tolerant.
The sensible thing to do is to find out what the local laws are regarding the ROW of your residential street. In Michigan, state and county road ROW is 33' on either side of the center line. That does not mean anyone can do whatever they want. I found this out while combating garage sale signs left everywhere. Residential areas probably have local codes.
Next, with information in hand, talk to the farmer first. You know the old rule about "going over the head" of the person whose behavior you are not satisfied with. It's tough to negotiate a solution if you don't communicate with the person in question. If he is unreasonable, then you have to take other action.
Finally, like my analogy above about the truck driver, today's farmers are burdened by government regulations as much (or more) as anyone else. If you were in their shoes, you might be more forgiving of them. Maybe there is a legitimate reason he avoids the county road. Maybe he doesn't realize the problem he is causing you.....I know that the dirt bikers that drag race a quarter mile away from me don't realize how much their noise annoys me....they're just having fun.
In my area, the suburbs are pushing into farm lands. Next thing you know, the people are complaining about the manure being spread on the fields. IMO, it's kind of like building your home next to an airport, then complaining of the noise. Was this farmer here before the residential area? Maybe he has an axe to grind.
I would talk to the county extension service or Farm Bureau Cooperative. They are supposed to be trained in dealing with the City/rural interface problems.
Yea, you have a right to be annoyed if this disrupts you from maintaining a nice lawn. I get annoyed all the time with people that turn around IN my lawn because they are too lazy to back up in the drive way. I feel your grief.
Good luck Labman!