Hi Greg,
 
Here in GA we use cotton fields every year between pollination jobs. It
makes excellent, very light honey, and plenty of it! When you tell your
honey customers where it came from, it makes them want to try it even more
and they always come back. Ask the grower if he has "B-T" cotton. This
doesn't need spraying therefore you can move your hives on in there closer.
Otherwise keep them at least 1/4 mile away.