This plot study in Iowa, to evaluate the effect of three phosphorous levels on corn yield with and without Vitazyme, revealed no significant yield differences but a solid trend for higher grain yields with Vitazyme an each phosphorous level. These increases ranged from 2 to 6 bu/acre, showing that the known mycorrhizae stimulation by Vitazyme’s active agents was bringing more phosphorus, and other ele- ments, into the plant for improved growth.