Soybean is a very valuable crop. Nitrogen and sulfur are important nutrients necessary to make the full use of soybean yielding potential. The aim of the research was to assess the agricultural and economic efficiency of nitrogen and sulfur fertilization used in soybean cultivation. The paper presents data obtained from a field experiment conducted in 2015–2017, in which the following factors were analyzed: I. Dose of nitrogen: 0, 30 and 60 kg ha–1, II. Dose of sulfur: 0 and 40 kg ha–1. To determine the efficiency, a direct surplus, and the agronomic and final efficiency of nitrogen and sulfur fertilization were calculated. It was shown that the dose of 30 kg ha–1 of nitrogen significantly increased the soybean yield compared to the combination without nitrogen fertilization, while the date of application was not significant. The highest soybean yields were obtained at a dose of 60 kg N ha–1. The beneficial effect of sulfur was found in combination without nitrogen fertilization and with a dose of 30 kg N ha–1 applied as top dressing. The index of agricultural and final efficiency of nitrogen fertilization with no added sulfur was the highest for a dose of 30 kg ha–1 applied pre-sowing, while under conditions of combined use of sulfur for a dose of 30 kg ha–1, but applied at the beginning of seed filling phase.
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