Nitrogen use efficiency of open-pollinated maize cultivars and topcrosses under low nitrogen soil.

The study was conducted to evaluate the nitrogen utilization efficiency (NUE) of open-pollinated maize cultivars under low nitrogen soil conditions. It took place at the Lower Niger River Basin Development Authority in Ilorin, Nigeria, during the 2019 and 2020 cropping seasons. The nitrogen treatments (0, 45, and 90 kg N ha⁻) were assigned as the main plots, while the genotypes were designated as sub-plots in a split-plot design.