Efeito da antecipação da adubação nitrogenada na pré-semeadura do milho aplicada sobre resíduos culturais de milheto

Abstract

There are several factors that interfere in the final productivity of corn (Zea mays), which are particularities of the environment in which the culture is installed. Nitrogen fertilization stands out among these, since nitrogen is the nutrient most required and exported by corn. By being a very satisfactory element, it can suffer expressive losses by the processes of volatilization and leaching, making it necessary to search for more effective management. In this context, an anticipation presents itself as a strategy capable of limiting these losses and intensifying the efficiency the use of nitrogen fertilizers. The objective of this experiment was to evaluate whether the practice of anticipation of nitrogen fertilization favored corn productivity, intercropped with brachiaria, when compared to conventional fertilization. The experiment was handled in Baixa Grande do Ribeiro - PI, with experimental design in randomized blocks with four replications and three plots. The treatments in the main plots were different doses of nitrogen (0, 135 and 200 kg N ha-1) on millet straw. After being committed to corn crop, the treatment in the three plots was 66 kg N ha-1 in coverage. For millet and brachiaria, dry matter production was evaluated and analyzed the plant tissue. For corn, grain yield, diameter of spike and spike length. There was a significant effect of different doses of nitrogen on corn productivity and nitrogen concentration in brachiaria straw.