The aim of this study was to determine the effect of herbicides and biostimulants on total nitrogen, protein nitrogen and total nitrogen uptake by tubers of three edible potato cultivars. Results were obtained from a three-year field experiment with the following factors: I – three edible potato cultivars – Bartek, Gawin, Honorata; II – five ways of herbicide and biostimulant application: 1 – site, 2 – mechanical-chemical treatments and Harrier 295 ZC herbicide, 3 – mechanical-chemical treatments and Harrier 295 ZC herbicide + at the end of plant emergence Kelpak SL biostimulator, 4 – mechanical-chemical treatments and Sencor 70 WG herbicide, 5 – mechanical-chemical treatments and Sencor 70 WG herbicide + at the end of plant emergence Asahi SL biostimulator. Total nitrogen content was determined in tuber dry matter using the Kjeldahl method. A significant effect of the factors on the content of total and protein nitrogen in tubers, and on the total nitrogen uptake by potato tubers was demonstrated. The highest total and protein nitrogen content was recorded in the tubers of Bartek cultivar, and the highest nitrogen uptake with the yield of Honorata cultivar.
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