I found your post intriguing.  I did a Google search for dryland rice, and came up with this study.  Read thru it.  If you read closely, I think suggests why rice is not grown in PA.  

On an aside.... 220 bu/acre corn is 12,300 lbs/acre.  Just saying.....

P.S. I forgot to add.... maybe you want to contact some of the individuals in that study for more information on their experiences.