Avaliação da produtividade de milho (Zea mays) em relação a aplicação de diferentes fontes de nitrogênio

Abstract

Agriculture has been growing on a large scale, and the corn crop has been gaining prominence and importance as a raw material for many products, both for food and fuel production. As a result, and because maize is a crop that responds very well to nitrogen fertilization, it is important to find more efficient nitrogen fertilizer Technologies for its cultivation. The aim of this study was to evaluate the maize yield with diferente sources of nitrogen fertilizer. The work was carried out at the UTFPR Dois Vizinhos campus experimental station. The sources evaluated were Urea (40% N), Urea+NBPT (45% N), Ammonium Nitrate (27% N), Ammonium Nitrate 70% of the dose and a control with no N, arranged in 20 plots measuring 4.5X6.0 m with 4 repetitions each. The dose of N applied was 180 kg ha-1 when the plants were at stage V5 of the corn, all at once, at the same time. Corn grain yield, yield components, thousand-grain mass and number of grains per ear were evaluated. It can be concluded that there were no significant differences for maize yields in general, but for NGE there was better use of the urea+NBPT, NA and NA 70% products in greater numbers, indicating that the use of these nitrogen fertilizers was efficient, and that there may have been some loss when using only urea. It was also noted that there were no differences in production in this type of soil and climatic conditions for NA 70% of the dose, showing a good costbenefit in the application of this fertilizer for the same yields, being an alternative for producers looking to guarantee a better cost of production in the region.