Sandy soil?

I was talking to my farmer friend recently. He said that potato farmers who have sandy soil are pulling an extra $1000 per acre in production over growers who don't have sandy soil. 

Sandy soil goes in streaks here. About 5 miles to my north is a sandy area, and farmers love it. Mine is a silty river-bottom stuff... and I've convinced myself that I'm going to add a lot of sand this winter and see what happens. I'll probably add only enough to amend two or three AG plots, but if it works, I'll be adding more each year and improving all my garden soil as I go.