Abstract

 In order to investigate the effect of nitrogen and potassium fertilizers on yield, quality and some quantitative characteristics of flue-cured tobacco cv.Coker347, 2 years experiment was carried out in Tobacco Research Institute of Rasht city located in Guilan province on factorial based using a factorial experiment with 8 treatments and 3 replications. The applied fertilizer levels included 35(N1), 45(N2), 55(N3) and 65 (N4) Kg N/ha as pure nitrogen and potassium in two levels of 150 (K1) and 200 (K2) Kg K/ha potassium as potassium sulphate. The measured parameters in this experiment included leaf yield, stem height, stem diameter, number of leaves, leaf length, leaf width, stem dry weight, biomass, flowering, nicotine and sugar content. The highest of leaf yield, plant height, leaf number were obtained by using 55 and 65 Kg N/ha. The highest amount of stem diameter, stem dried weight and biomass obtained when 55 Kg N/h was applied. The greatest leaf length belonged to usage of 45, 55 and 65Kg N/ha. The longest flowering period was gotten when 65 Kg N/ha was utilized. The maximum dried leaf yield, stem height, stem sickness, leaf number, leaf length, stem dried weight and biomass belonged to 200 Kg K/ha level and the highest nicotine percentage was detected when 150 Kg K/ha was used. 65 Kg N/ha and 200 Kg K/ha level had the highest amount of dried leaf yield. The greatest number of leaves and leaf length were associated with using 55 Kg N/ha and 200 Kg K/ha as well as using 65 Kg N/ha and 200 Kg K/ha. Applying 65 Kg N/ha and 200 Kg K/ha, 55 Kg N/ha and 150 Kg K/ha indicated the highest amount of biomass. Utilizing 150 Kg K/ha in fist year led to the longest flowering period.

Key words: Nitrogen, potassium, yield, quality, flue-cured tobacco.