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Peter Kováčik
Department of Agrochemistry and Plant Nutrition, The Faculty of Agrobiology and Food Resources, Slovak University of Agriculture in Nitra, Tr. A. Hlinku 2, 949 01Nitra, Slovak Republic
Peter Šalamún
PhD., Department of Environmental and Plant Parasitology, Institute of Parasitology, Slovak Academy of Sciences, Hlinkova 3 / Puškinova 6, 04001Košice, Slovak Republic
Jadwiga Wierzbowska
Chair of Agricultural Chemistry and Environmental Protection, University of Warmia and Mazury in Olsztyn, Oczapowskiego 8, 10-719Olsztyn, Poland