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Vladimír Šimanský
Department of Soil Science, FAFR - Slovak University of Agriculture in Nitra, 949 76 Nitra, Tr. A. Hlinku 2, Slovak Republic
Peter Kováčik
Department of Agrochemistry and Plant Nutrition, FAFR – Slovak University of Agriculture in Nitra, 949 76 Nitra, Tr. A. Hlinku 2, Slovak Republic