Corn Injury from Broadcast Nitrogen
N per acre with UAN 32% solution.
Rescue nitrogen applications in a standing corn crop may be necessary when wet conditions prevented preplant N applications or loss of N was suspected due to wet conditions after application. Field research at Albany, Columbia, Novelty, and Portageville in 2003 and 2004 evaluated the impact of AN (ammonium nitrate), UAN (urea ammonium nitrate), urea, and urea plus Agrotain applied broadcast and between-row as a preplant and postemergence application to 1, 2, 3, and 4 ft corn. Broadcast applied N injury was ranked UAN solution > AN > urea = urea + Agrotain. Application timings are preplant, 1 ft corn, 2 ft corn, 3 ft corn and 4 ft corn. Generally the taller the corn plant were when fertilizer was applied the shorter the time the plants had to recover from leaf burn injury before beginning reproduction and lower the corn yield response to nitrogen. Results from this research were submitted to a journal for publication. Request more information.