Post-silking Factor Consequences for N Efficiency Changes Over 38 Years of Commercial Maize Hybrids.

ABSTRACT: Hybrid selection in maize (Zea mays L.) over the decades has increased post-silking dry matter (PostDM) and nitrogen (PostN) accumulation, often with an accompanying increase in one or more N use efficiency (NUE) metrics such as partial factor productivity (PFP), N conversion efficiency (NCE), and N internal efficiency (NIE). More certainty on the underlying mechanisms of how PostDM and PostN changes over time have contributed to NUE gains or losses in modern-era hybrids can only be realized by directly comparing hybrids of different eras in the context of production-system-relevant management systems. A two-year and two-location field study was conducted in Indiana with two N rates (55 and 220 kg N ha-1), three plant densities (54,000, 79,000, and 104,000 plants ha-1) and eight commercial

SUBMITTER: Chen K 

PROVIDER: S-EPMC5641558 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature