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The aim of the study was to evaluate the content and nutritional value of iron and manganese in edible potato tubers. Field experiments were carried out in 2015-2017 with the use of biostimulators on the individual farm in Międzyrzec Podlaski, Poland. The experiment was based on the random splitplot method. The influence of two factors was examined. The first row factor included three varieties of edible potato: Honorata, Jelly, Tajfun, and the second row – five methods of using biostimulators: Kelpak SL, Titanit, GreenOk, BrunatneBio Złoto Cytokininy, potato plants sprayed with distilled water were the control object. Potato plants were treated three times with biostimulators (at the beginning of flowering, at full flowering and after plant flowering). The high amount of rainfall in 2017 contributed to the increase of iron and manganese content in potato tubers. Plant tubers treated with the BrunatneBio Złoto Cytokiny preparation were characterized by the highest content of iron and manganese in comparison to plants from the control object. Titanite reduced the content of manganese and iron in tubers. The content of micronutrients in tubers was significantly differentiated by the genotype of the variety. The highest Mn concentration was found in the Jelly tubers, Fe in the Honorata variety. The average content of manganese was 4.4 mg∙kg, and iron 43.5 mg∙kg, which covers the demands in 1.7 and 5.5% per day, respectively.

THE CONTENT OF IRON AND MANGANESE IN POTATO TUBERS TREATED WITH BIOSTIMULATORS AND THEIR NUTRITIONAL VALUE