Greg Roth, a professor at Penn State University, explains how interseeding is a system designed to help establish cover crops in areas where cover crop establishment is not that feasible because of a late harvest and short season. With this system, cover crops are interseeded early in the season, but provide minimal competition to the corn. The interseeder is designed to be able to apply sidedress N fertilizer and a post-emergent herbicide while seeding the cover crop, eliminating the need for additional trips across the field and reducing the cost of seeding the cover crop.