Posted 5/22/2020 12:03 (#8273411 - in reply to #8273206) Subject: RE: How long can I wait to side dress this corn?
Near-north Ontario, French River
If you get on in time, and have adequate rainfall afterwards I see no reason why there would be a yield drag to top dressing. Any drag probably comes from waiting too long, the starter or preplant N begins to run out, or there's insufficient rain after the fact to move the N into the soil profile.