Cassim, Bruno Maia Abdo RahmenBatista, Marcelo Augusto2024-05-242022https://deposita.ibict.br/handle/deposita/608Improvements in nitrogen use efficiency (NUE) in corn production systems are necessary to decrease economic and environmental losses which are mainly caused by ammonia volatilization (NH3-N) loss. The objective of this work was to study the different nitrogen (N) fertilizer technologies through characterization of N sources, NH3-N volatilization losses and their effects on the nutrient concentration and yield of corn grown in clayey and sandy soils in Northwest Paraná. The treatments consisted of a control without N application as topdressing, three conventional N sources (urea, ammonium sulfate, and ammonium nitrate + calcium sulfate), and three enhanced-efficiency fertilizers: urea treated with N-(n-butyl) thiophosphoric triamide (NBPT) + Duromide, urea formaldehyde, and polymer-coated urea (PCU) + urea treated with NBPT and nitrification inhibitor (NI). The nitrogen losses by NH3-N volatilization were up to 46% of the N applied with urea. However, NI addition to urea increased N losses by NH3-N volatilization by 8.8 and 23.3% in relation to urea alone for clayey and sandy soils, respectively. N fertilizers technologies applied in topdressing on clayey and sandy soil presented the following decreasing order of losses by N-NH3 urea > URP + Ur-NBPT + IN > Ur-NBPT + Duromide > Ur-formaldehyde > ammonium nitrate + calcium sulfate > ammonium sulfate. Clayey soil was 38.4% more responsive than sandy soil to N fertilization. Ammonium sulfate and ammonium nitrate + calcium sulfate showed the best results, because increased corn yield in clayey soil and contributed to reductions in NH3-N emissions of 84 and 80% in relation to urea, respectively.application/pdfOpenAccessUreiaVolatilização de amôniaFertilizantes de eficiência aumentadaInibidor de nitrificaçãoNutrição mineral de plantasUreaAmmonia volatilizationEnhanced-efficiency fertilizersNitrification inhibitorPlant mineral nutritionCiências agráriasAgronomiaCiência do soloFertilidade do solo e adubaçãoDissertação