Effect of Rhizobium and Plant Growth Promoting Rhizobacteria on Yield and Yield Components of Common Bean

Document Type : Research Article

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Abstract

In order to study the effects of rhizobium and plant growth promoting rhizobacteria on yield and yield components of bean (Phaseolus vulgaris L. var. Sadri), an experiment was carried out at Research Station of Ekbatan, Hamedan province during 2010-2011 cropping season. The experiment was conducted in factorial on the basis of randomized complete block design (RCBD) with three replications. Factor A, including 4 levels of Rhizobium legominosarum bv. Phaseoli (Rb 147، Rb 114، Rb 116 and no inoculation) and factor B, consisted of four levels of promoting growth plant rhizobacteria (Azospirillum lipoferum 21, Azotobacter chroococcum 5, Pseudomonas putida 168 and no inoculation). The result of analysis of variance showed that different races of rhizobium and promoting growth plant rhizobacteria (PGPR) had significant effects (p< 0.01) on number of pods per plant, harvest index and seed yield. But there were not significant effects on number of seeds per pod, 100 seeds weight and plant height. The highest number of pods per plant was obtained by inoculation of RB116 along with Azotobacter which produced 43 percent higher than no inoculation. Inoculation by RB116 without promoting growth plant rhizobacteria could produce the highest harvest index which was 57 percent higher than check. The highest seed yield (3812 kg/ha) was achieved by inoculation of RB116 along with Azotobacter which produced 80 percent higher than no inoculation.

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