Herbicide Residues and Nitrate Concentration in Tubers of Table Potatoes

Abstract

This study examined Wiking-cultivar table potato tubers in a field experiment conducted between 2002 and 2004 using a rye complex soil. The experimental factors included (a) two methods of tillage, including traditional and simplified, as well as (b) seven methods of cultivation with the use of herbicides as follows: 1, control without herbicides; 2, Plateen 41.5 WG; 3, Plateen 41.5 WG + Fusilade Forte 150 EC; 4, Plateen 41.5 WG + Fusilade Forte 150 EC + adjuvant Atpolan 80 EC; 5, Barox 460 SL; 6, Barox 460 SL + Fusilade Forte 150 EC; and 7, Barox 460 SL + Fusilade Forte 150 EC + adjuvant Atpolan 80 EC. Determination of residues was performed using high-performance liquid and gas chromatography. Only trace quantities of bentazone (Barox 460 SL) were found in potato tubers, amounts that fell below the maximum residue limit (MRL). The nitrate content of potato tubers was determined using a nitrate ion-selective electrode and silver chloride reference electrode. The nitrate content in fresh matter of unpeeled and peeled tubers depended significantly only on weather conditions in the years of study. In contrast, agrotechnical procedures such as methods of tillage and cultivation did not significantly affect potato tuber nitrate content.