Published in Scientific Papers. Series B, Horticulture, Vol. LXIV, Issue 2
Written by Nikolay PANAYOTOV, Alexander TRAYANOV

The main aim of this study was to determine the effect of different levels of mineral fertilizers and fertilization methods on the productivity of carrot seeds. The experiments were conducted with the Tushon variety. The seed plants were grown using standard technology through stecklings. Three levels of NPK were tested, as follows N_0,50,70,90 kg/ha, P₂O_{5 0,90,140,190} kg/ha and K₂O_{0,100,150,200} kg/ha, applied once and twice. The number of umbels per order, number of umbellate per umbels, diameter of umbels, weight of seeds per umbel and percentage of normally developed seeds as well as yield and part of different orders for yield formation for central umbel (king umbel) and umbels from I, II and III orders were studied. The highest yields were found to occur with a single application of N₉₀P₉₀K₂₀₀ and double fertilization with N₉₀P₉₀K₁₀₀. Seeds obtained from the first and second orders are characterized with the highest ration in yield formation, the average for tested variants is 50.61% and 30.57% respectively. The strongest positive correlation between yield and number of umbels and umbellate, umbel diameter and weight of seeds per umbel were established.

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