Split an 80 of corn on corn this year with yet again 0 yeild gain.

Im about done testing this product.  Last year 0 yeild gain on corn and navies, year before that same on soys.......

Local agronomist says its a variety thing.......some of the varieties he mentioned, well, we quit planting them years ago due to obviouse reasons.

Trying to keep an open mind here.....

Thanks