THE EFFECT OF AGROTECHNICAL FACTORS ON THE POTASSIUM CONTENT AND ITS REMOVAL BY POTATO TUBERS

A 3-year field experiment covered two methods of soil tillage, conventional and simplified, as well as the following herbicide options: Plateen 41,5 WG, Plateen 41,5 WG + Fusilade Forte 150 EC, Plateen 41,5 WG + Fusilade Forte 150 EC + adjuvant Atpolan 80 EC, Barox 460 SL, Barox 460 SL + Fusilade Forte 150 EC, Barox 460 SL + Fusilade Forte 150 EC + adjuvant Atpolan 80 EC and control object – mechanical weeding. Potassium content and its removal by potato tubers significantly depended on soil tillage methods, weed control methods and research years. More potassium was contained in tubers harvested from conventional tillage compared with the reduced tillage. Herbicides applied in the potato field significantly decreased potassium content in tubers compared with the control object. Simplifications of soil tillage decreased potassium accumulation in potato tubers compared with the conventional tillage. Significant changes were also observed in content of potassium and its removal by 1 tonne tubers between the experimental years