Integrated Application of Biofertilizers and Chemical N and P on Quantitative and Qualitative Characteristics of Male-Streile Tobacco (Nicotiana tabacum L. cv. PVH19)

The aim of this study was to investigate the effect of the combined application of nitrogen and potassium biofertilizer at different levels of nitrogen and potassium chemical fertilizer on leaf yield and qualitative characteristics and of tobacco PVH19 cultivar.

a field study was done in 2016-2017 cropping seasons. A randomized complete block design with 11 treatments and three replications was used at Tobacco Research Institute in Rasht. Treatments were combined of nitrogen and potassium fertilizer, potassium biofertilizer (Potabarvar2= BK) and nitrogen biofertilizer (Azetobarvar= BN). Treatments include: T1: control, T2:FK100+ FN100T3:FN100+FK75+BKT4:FN100+FK50+BKT5:FK100+FN75+BNT6:FK100+FN50+BNT7:FN75+BN+FK75+BKT8:FN75+BN+FK50+BKT9:FN50+BN+FK75+BK T10: FN50+BN+FK50+BK T11: BK+BN.

Mean comparison showed that maximum yield of green leaf (47867 kg.h-1) was obtained from FN100+FK50+BK treatment. Maximum dry matter income FN50+BN+FK50+BK treatment was 6695.5 kg.ha-1. Result of qualitative analysis showed that the highest percentage of nicotine, reducing sugars and nitrogen percentage treatments were in FN75+BN+FK75+BK combined treatment. Result showed that maximum of percentage of potassium in leaves was obtained from FN50+BN+FK75+BK treatment.

Results of this experiment showed that, using integrated biofertilizer and chemical fertilizer without significant decline in leaf yield of tobacco, could be reduce chemical fertilizer and its impacts on environment. Based on the results obtained from this study in order to increasing leaf yield and qualitative characteristics and of tobacco PVH19 cultivar was obtained from FN50+BN+FK50+BK treatment and was suggested in Rasht reign conditions.