Fertility Components Critical For High Yield Corn

Nitrogen. Multiple applications of N are more efficient and result in higher yields (preplant, starter, pre-tassel applications through pivot or sidedress, and post-tassel applications). Additionally, multiple applications improved N use efficiency and reduce potential for stalk rot organisms to infect corn stalks.

Post Tassel N Applications.
Post-tassel (post-flowering) applications of N can increase yields by increasing kernel depth and test weight. In Dupont/Pioneer research, applying a significant portion of the applied N at brown silk averaged 31 bu/a more than applying all N before tassel. Modern hybrids can respond well up to 33 percent of N rate goal going on between brown silk and dough stage. Recent Purdue research has shown that the newest corn hybrids use more N post-tassel than the hybrids of several years ago.

Russel French, Robert Bowling and Alyssa Abbott – Dupont/Pioneer

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