Effect of nitrogen and potassium on yield, agronomy efficiency, physiological efficiency and recovery efficiency of nitrogen and potassium in flue cured tobacco

ABSTRACT: In order to investigate the effect of nitrogen and potassium fertilizers on yield and agronomy efficiency, physiological efficiency and recovery efficiency of nitrogen and potassium of cv.Coker347 and cv.K326 of Flue-cured tobacco, 2 year experiment was carried out in Tobacco Research Institute of Rasht located in Guilan province on factorial based with 3 replications. The applied fertilizer levels included 35 (N1), 45 (N2), 55 (N3) and 65 (N4) Kg pure nitrogen/ha-1 of from urea source, and potassium in two levels of 150 (K1) and 200 (K2) Kg K/ha-1 from potassium sulfate source. measured parameters in this experiment included dry leaf yield, green leaf yield, agronomy efficiency of nitrogen, physiological efficiency of nitrogen, recovery efficiency of nitrogen, agronomy efficiency of potassium, physiological efficiency of potassium and recovery efficiency of potassium. Effect of year on dry leaf yield, agronomy efficiency of nitrogen, agronomy efficiency of potassium, physiological efficiency of potassium and recovery efficiency of potassium was significant (p < 0.01). Effect of variety on agronomy efficiency of nitrogen and green leaf yield was significant on 1% and 5% levels respectively. Nitrogen had significant effect on recovery efficiency of nitrogen and recovery efficiency of potassium on 1% and 5% levels respectively. Potassium had also significant effect on dry leaf yield, agronomy efficiency of nitrogen, recovery efficiency of nitrogen (p < 0.01). Interaction between cultivar and nitrogen was significant on dry leaf yield, green leaf yield, agronomy efficiency of nitrogen, physiological efficiency of nitrogen, recovery efficiency of nitrogen, agronomy efficiency of potassium, physiological efficiency of potassium and recovery efficiency of potassium (p < 0.01). Interaction between cultivar and potassium was significant on dry leaf yield, recovery efficiency of nitrogen, potassium crop yield, recovery efficiency of potassium (p < 0.01). This interaction was also significant on agronomy efficiency of nitrogen and physiological efficiency of nitrogen (p < 0.05). Interaction between nitrogen and potassium was significant on agronomy efficiency of nitrogen (p < 0.01). This interaction was also significant on dried leaf yield and recovery efficiency of nitrogen (p < 0.05). Interaction among variety, nitrogen and potassium on dry leaf yield, green leaf yield, recovery efficiency of nitrogen, agronomy efficiency of potassium, physiological efficiency of potassium and recovery efficiency of potassium was significant (p < 0.01). Mentioned interaction was also significant on physiological efficiency of nitrogen (p < 0.05). Interaction between year and variety on recovery efficiency of potassium as well as interaction between year and variety on recovery efficiency of nitrogen was significant (p < 0.01).