In this Iowa field corn study, despite excessive wetness early and late in the season, the yields were increased 2.0 to 2.4%, and bushel weights were increased up to 1.5 lb/bushel with Vitazyme, although bushel weights were rather low due to stalk rot and other diseases. Vitazyme may have had a positive effect on grain drydown rates. Yield effects were consistent, giving about a 5.0 bu/acre increase at all three nitrogen levels. These increases were very profitable: at $4.00/bushel, then this 5 bu/acre improvement would lead to a gross increase of $20.00/acre.