I did a bit of an inadvertent test myself. On some hillside strips I was not a very good driver and where the planter was not on the strip both the the corn AND the beans did not emerge nearly as well as where I was on the strip. jmho

So, how were you planning on replicating that test across the field?  If you need my help, I have that (lack of) talent, as evidenced by my rows this year