abstract: The paper presents results of research conducted from 2008 to 2011 to determine the effect of manuring with undersown catch crop and production system on the microelement content in potato tubers. The following two factors were examined in the study: I. manuring with undersown catch crop (control – no undersown catch crop manure, farmyard manure, white melilot, westerwolds ryegrass, white melilot – mulch, westerwolds ryegrass – mulch), II. production system: integrated and organic. Spring triticale cultivated for grain was undersown with catch crops which, after incorporation, were followed by table potato. The following contents were determined in potato tubers: nitrogen, phosphorus, potassium, calcium and magnesium. The highest nitrogen content was recorded in the tubers of potato following white melilot mulch, and the highest phosphorus, potassium, calcium and magnesium contents in the tubers of potato following autumn-incorporated white melilot in the integrated production system.