A field experiment was carried out in the years 2002-2004 at the Zawady Experimental Farm owned by the University of Podlasie, Siedlce (52^o06’ N; 22^o06’ E). The factors were: two methods of soil tillage (conventional and simplified), and four methods of weed control in potato cultivation based on herbicide application. The objective was to determine economic effects of various weed control methods in potato cultivation. The economic effectiveness of the four methods of weed control in potato cultivation, for both the conventional and simplified tillage method, was conditioned by costs of weeding operations, herbicide prices, the level of yield and its value. The highest profitability of weed management was found in the treatment where mechanical and chemical control, including Plateen 41.5 WG herbicide (1.6 kg·ha^-1) + Fusilade Forte 150 EC graminicide (2.0 dm·ha^-1) + Atpolan 80 EC adjuvant (1.5 dm^3·ha^-1), was applied. The financial result was also improved by the soil tillage methods. The simplified soil tillage was more effective from the economic standpoint.

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