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Corn is among the main agricultural products produced in Brazil, mainly due to its importance in human and animal food. Corn productivity is mainly related to climatic conditions and nutritional management, especially concerning nitrogen. The study's objective was to evaluate the response of corn hybrids subjected to nitrogen doses in a low-altitude subtropical environment. The experiment was conducted in the agricultural year of 2019/2020 in the municipality of Santa Maria-RS. The experimental design was of completely randomized blocks in a subdivided plot. Four corn hybrids, DKB 240 PRO 3, DKB 290 PRO 3, DKB 345 PRO 3, and Ag 9025 were used as the main plot, and six doses of nitrogen, 0, 50, 100, 150, 200, and 250 kg ha-1 in subplots. We evaluated the number of grain rows (NR) per cob, number of grains per row (NGR), cob length (CL, cm), average grain length (GL, cm), total grain weight per cob (GWC, g), thousand-grain mass (TGM, in g), and grain yield (YIE, in kg ha-1). The data were submitted to the analysis of variance (F test), and the means were compared by the Scott-Knott test at 5% of error probability and submitted to regression analysis. Cultivar Ag 9025 had the highest grain yield, associated with the highest CL, GL, GWC, TGM. The higher GL associated with high TGM compensated for the lower averages of NR and NGR for this cultivar. The maximum technical efficiency for the cultivars was 196.22 kg ha-1 of nitrogen. The mass economic efficiency with commercial values of the 2019/2020 harvest for the cultivars was 185.84 kg ha-1. [ABSTRACT FROM AUTHOR]

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