NW Kansas
$50 cash rent, seed $40.5 at 18000 pop, fert 100lbs N $40, Phos 20 lbs $10, Chemical and application $30, planting $15, harvest $45, insurance $19 Total $249.50
$249.50 at 3.50 is a 71.3bu/acre break even
I could be forgetting a few things but in an average rainfall year 100-120bu corn