In order to Comparison of agronomical nitrogen use efficiency in three cultivars of corn as affected
by nitrogen fertilizer levels, a split plot experiment based on randomized complete block design with three
replications was conducted in research field of Islamic Azad University, Ardabil branch, Ardabil, Iran, in 2009.
Factors were: nitrogen levels in main plots (0, 60, 120 and 180 Kg N haG1 and corn cultivars in sub plots
(Kenez410, Korduna and Konsur). Traits of NUE, HI, kernels yield, 1000 kernels weight and numbers of kernels
per ear and row and row per ear numbers studied. Most of the traits were affected by treatments. Maximum yield
was obtained at Korduna×180 kg N haG1. Maximum nitrogen use efficiency was obtained at Korduna×60 kg
N haG1. Also, results showed that whit increasing nitrogen levels, Nitrogen use efficiency significantly
decreased. Increasing of nitrogen levels led to significantly increase in number of kernels per row, number of
kernel per ear and 1000-kernels eight. In all traits except numbers of row per ear Korduna cultivars was superior.