Using Nitrogen Efficiency Component Analysis to Evaluate Site-Specific N and Seed Rate Management Strategies for Improving NUE.

Nitrogen use efficiency component analysis is an important evaluation tool for assessing differences in N use and productivity among different management strategies. Nitrogen use efficiency is partitioned into soil and plant physiological processes through measurements of grain yield, grain N, aboveground plant N, applied N, and post-harvest inorganic soil N following the approach of Huggins and Pan (1993). A randomized complete block, split plot design with N fertilizer rate as the main plot and seeding rate as the subplot was employed across different landscape positions in 2011 and 2012 at the Cook Agronomy Farm. Component analysis performed on the soft white winter wheat plot trials in 2011 and 2012 will be presented.