I have not used it on corn but been putting it on beans for about a decade now. Haven't used any other fertilizer while using fish. We apply it in furrow and as a foliar. Stinks like hell. You'll be sleeping on the couch for a while. Don't leave product sit for too long or it will become thick and won't move through your plumbing. You will need bigger screens and clean them often. I think you'll need something like 50 to 60 gal/a for corn.