I did a couple on purpose through ISU.  They had 30 lbs with the planter.  Rate listed was the sidedress rate plus 30 for total N.
I was very surprised the 0 rate did 130 with as much rain as we had and flushed so much Nitrogen out this year.

Intended Avg Applied % of Obs Yield C.V. Yield (bu/ac)

A 0 0 100.00 0.52 132

B 64 64 50.00 0.35 183

C 96 98 50.00 0.38 217

D 128 127 50.00 0.39 234

E 160 153 50.00 0.48 235

Intended Avg Applied % of Obs Yield C.V. Yield (bu/ac)

A 0 0 100.00 0.28 135

B 64 64 50.00 0.34 179

C 96 96 50.00 0.34 197

D 128 127 50.00 0.31 216

E 160 158 50.00 0.20 238