Abstract
Summary The aim of the field studies carried out in 2004–2006 was to determine the influence selected insecticides (Actara 25 WG – 0.08 kg/ha, Regent 200 SC – 0.1 l/ha, Calypso 480 SC – three rates: 0.05; 0.075; 0.1 l/ha), used for the control of potato beetle, on the content of total nitrogen and protein nitrogen in potato tubers of three potato cultivars (Wiking, Mors, Żagiel). The insecticides applied significantly increased total nitrogen and protein nitrogen as compared with the tubers harvested from the control variant without no chemical protection was applied. The tubers of Wiking and Mors cultivars showed the highest total nitrogen content and protein nitrogen content, respectively.
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