Interseeding alfalfa into corn silage increases corn N fertilizer demand and increases system yield

Interseeding alfalfa (Medicago sativa L.) into corn (Zea mays harvested as silage can increase rotation productivity and reduce negative environmental impacts, but the importance of N fertilizer management for successful implementation interseeding system remains unexplored. Nitrogen enhanced leaf chlorophyll content, yield, total content with interseeded conventional solo-seeded at two locations in southern Wisconsin. However, greater rates (additional 83 kg ha−1 one location; could not be estimated second location) were needed to maximize yield when was interseeded, suggesting that effectively competed N. Maximum yields depressed by 7–16% subsequent year 40–160% than spring-seeded alfalfa, resulting forage over 2-year study period. Alfalfa plant density after harvest greatest low rates, all resulted acceptable stands good studies. This is first demonstration application additional ensure high without causing major issues establishment. Additionally, split where half rate broadcast planting balance banded along row a side-dressing did influence most or responses compared single planting. Results this work previous studies suggest near maximal obtained if applied 224 ha−1, further refinement other crop practices is, however, production stewardship potential system.