Economic feasibility of sources and doses of nitrogen in second crop corn in no-till system

Nitrogen (N) is the most required nutrient to corn crop (Zea mays L.), and its cost is a significant stake in the profitability of second crop corn. This work aimed to determinate the economic viability of the usage of several sources and rates of nitrogen in the productivity of second crop corn in no-till system. The experiment was developed in an Oxisol, during the agricultural years of 2007 and 2008. Treatments included three N sources (Ammonium sulfonitrate with nitrification inhibitor, ammonium sulfate, and urea) in five N rates (0, 50, 100, 150 and 200 kg ha -1 ), totally applied in the coverage, in six leaf stage (V6). The economic analysis considered the N fertilization costs and the yield additions provided by the N fertilization handling for each relative treatment. The nitrogen fertilization at rate the 100 as ammonium sulfate and 150 kg ha -1 of N or ureia provided the greatest profitability. The ammonium sulfonitrate with nitrification inhibitor provided low profitability and the ammonium sulphate provided the greatest profitabilities with the use of smaller doses of N (150 kg ha -1 of N) compared to urea.