This paper presents calculations based on results of a field experiment, in which selected potato cultivars grown for industrial processing received different fertilization. The data originated from trials on three potato cultivars: Adam, Pasja Pomorska and Ślęza, at set up at the Research Station in Bałcyny, owned by the University of Warmia and Mazury in Olsztyn, and completed in 2008-2010. The economic analysis included planned and performed treatments as well as such information as the type of technical equipment, labour and draught force input, or material outlays. Based on the analysis, it can be concluded that the three starch potato cultivars responded differently to foliar fertilization. The cv. Pasja Pomorska yielded the highest under soil fertilization with 280 kg·ha^-1 NPK (80 N, 80 P, 120 K) and foliar application of Basfoliar 12-4-6 in a dose of 8 dm³·ha^-1. Considering the ratio of the yields to costs, cv. Ślęza was characterized by the best profitability index, which in every technological variant reached a value of over 2.0. From the point of view of rational economy, the most profitable was the fertilization combination which consisted of soil fertilization with 420 kg·ha^-1 NPK (120 N, 144 P, 156 K) and foliar application of Basfoliar 12-4-6 with Solubor DF in amounts of 4 + 1 dm³·ha^-1.

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