There seems to be more 20" row beans planted in this area (NE IL) this year. Still lots of 15" rows, some 10" & some 30" rows. No corn that I know of.

What about your area? More or less 20" rows for beans only?

What is advantage of the 20" beans? Maybe less moving machinery parts on a 40-60' planter? 

How about yield or weed control?