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The experiment was conducted in the years 2007-2009. The aim of the study was estimation of the effect of sowing rate (6, 8, 10, 12 i 14 kg ha-1) on the quantity and quality of the yield of onion cv. ‘Rosa Lunga di Firenze’. On the base of obtained results it was proved that used in the experiment sowing rates did not differ significantly the quantity of yield of onion cv. ‘Rosa Lunga di Firenze‘. However, it was noted that the highest participation of bulbs of the least diameter was obtained when the highest sowing rate was used. Sowing rate of 14 kg ha-1 had also an influence on decrease of single bulb weight of bulbs <2 cm in diameter and on decrease of single bulb weight and diameter of bulbs 2-4cm in diameter. Moreover, it was found that yield of onion cv. ‘Rosa Lunga di Firenze’ was characterized by a high content of mineral compounds.