The objective of the study was to investigate the impact of sulphur application on the content (g kg-1) and uptake (kg ha-1) of phosphorus and potassium with the yield of potato tubers. In 2004-2006, a field experiment on potato was conducted, in which S was applied in different forms (elemental and K2SO4) and doses (0, 25 and 50 kg ha-1). The content and uptake of P and K in the dry mass of potato tubers was significantly increased by sulphur. The application of sulphur increased the P content and uptake irrespective of the S dose, but elemental S proved more effective. The K content was the highest when sulphate was applied at 50 kg S ha-1. The K uptake by tubers was significantly increased by both of the applied doses versus the control plots. The tuber yield depended substantially on the rate of S fertilizer. Sulphur applied as sulphate increased the content of SO4-S in the soil. The application of elemental S in a dose of 50 kg ha-1 decreased the soil pH. The soil content of total C was dependent on each dose and form of the applied sulphur. The content of SO4-S and total C in the soil positively correlated with the P content and uptake by potato tubers. A negative correlation was found between the pH value and content and uptake of P by potato tubers. No correlation was found between K and soil parameters, but a positive correlation was found between the P and K uptake by tubers and between the P and K uptake versus tuber yield.  

20(3)2015