2025-02-072025-02-072020OLIVEIRA, Vinícius Almeida et al. Yield response of upland rice as influenced by enhanced-efficiency nitrogen fertilizers in the brazilian cerrado. Journal of Agricultural Science, Toronto, v. 12, n. 11, p. 98-106, 2020. DOI: 10.5539/jas.v12n11p98. Disponível em: https://ccsenet.org/journal/index.php/jas/article/view/0/43918. Acesso em: 11 out. 2024.1916-9752e- 1916-9760http://repositorio.bc.ufg.br//handle/ri/26599Nitrogen (N) fertilizers have their use efficiency adversely affected by the rate and source of N. A two-year field experiment was conducted to examine the yield response of upland rice by using NBPT (urease inhibitor), PCU (polymer-coated urea) and uncoated urea under different N application rates. It was hypothesized that either NPBT or PCU may result in increased yield components of upland rice when compared to conventional urea. The experiment was set up in a randomized block design in a 3 × 4 + 1 factorial scheme, with four replicates. Treatments comprised three sources (conventional uncoated urea, NBPT-treated urea, and polymer-coated urea) and four rates (30, 60, 90 and 120 kg ha-1) of N, in addition to a control treatment (no fertilizer application). Nitrogen fertilizers were applied in two split doses: 50% at the seedling stage, and 50% at the tillering stage (~80 days after planting). The results revealed that the use of enhanced-efficiency N sources increased the productivity and plant height of upland rice crop when compared to conventional urea. As compared to when it is untreated or polymner-coated, treating urea with NBPT resulted in increased 100-grain weight.engAcesso Abertohttp://creativecommons.org/licenses/by-nc-nd/4.0/Grain yieldFertilizer efficiencyOryza sativa LArtigo10.5539/jas.v12n11p98