The intensification of corn production systems has increased the productivity of this grain, mainly due to the application of nitrogen fertilizers, which has contributed to the increase in farmers' profitability. On the other hand, there are greater environmental impacts, mainly related to the greater emission of nitrous oxide from these systems. In an attempt to reduce this type of impact, synthetic chemical products are being added in small amounts to nitrogenous fertilizers, in order to act in the main processes responsible for the “losses” of nitrogen in the soil-plant system. These products are urease and nitrification inhibitors.Parallel to the use of these additives to nitrogen fertilizers, the inoculation of corn seeds with nitrogen-fixing bacteria appears as an alternative to reduce “losses” and improve the efficiency of nitrogen fertilization, also contributing to the mitigation of nitrous oxide emissions from the soil to the atmosphere.Although some work has been carried out in southeastern Brazil to measure the efficiency of these technologies to reduce nitrogen emissions from agricultural systems, it is indispensable to carry out these tests for the edaphoclimatic conditions of northern Mato Grosso, especially for corn crops in succession to soybeans, which receive significant amounts of nitrogen and ever-increasing areas are being cultivated with these grains.Urea is the most used source of nitrogen fertilizer in agriculture because it has a higher nitrogen content in its formula, because it is easier to manufacture and, mainly, because it is more affordable. The identification of additives, or biological nitrogen fixation, associated with this nitrogen source that provides greater agronomic efficiency and lower nitrous oxide emissions, added to other data, would allow indicating the best fertilization management strategy to achieve productive systems in the more profitable corn for our region. This would benefit our farmers and we would also have the real contribution of corn coming from the north of Mato Grosso to nitrous oxide emissions in the Brazilian agricultural sector.Thus, this work is based on the hypothesis that urease and nitrification inhibitors, and biological N fixation, are alternatives for mitigating N2O emissions from soils that receive nitrogen fertilization (urea) in top dressing in the cultivation of corn in succession to soybeans in the northern region of Mato Grosso. (Google translation)