Effects of Nitrogen and Potassium Fertilizers on some Agronomical and Morphologic Features of Flue Cured Tobacco Varity No.: K326

In order to verify effects of nitrogen and potassium fertilizers on some of agronomical and morphological features of flue cured tobacco, an experiment was done in agronomical year 2008 in Rasht Tobacco Research Institute located in Guilan Province in design of factorial with 3 replication. Fertilizing levels used, were including: (N1)³⁵, (N2)⁴⁵, (N3)⁵⁵ and (N4)⁶⁶ Kg N/ha and (K1) ¹⁵⁰ and (K2)²⁰⁰ Kg K/ha. Yield of dry leaf (dry weight of leaf), flowering, dry weight of stalk, biological yield (biomass) and harvest index were studied. Effects of nitrogen on yield of dry leaf and dry weight of stalk in probability level of 5% and on flowering and biomass in probability level of 1% became significant. Potassium had a significant effect on flowering in probability level of 1%. Also, interaction effects of nitrogen and potassium on flowering in probability level of 5% and on biomass and harvest index in probability level of 1% have been significant. Comparison of average effect of simple nitrogen showed that the highest performance rate of dry leaf, dry weight of stalk and biomass have been gained as a result of application of 35 kg N/ha. Also, according to the table for comparison of average effect of potassium, the highest rate of flowering has gained been due to consumption of 150 kg K/ha. According to the table for comparison between average mutual effects of nitrogen and potassium, the highest yield rate of dry leaf from treatments 5 and 1, the highest rates of flowering and harvest index from treatment 6, the highest rate of dry weight of stalk and biomass have been gained from treatment 5.