ABSTRACT
Since phosphorus is the vital nutrient for plants, the evaluation of phosphorous fertilizers effects on yield and quality of valerian is necessary. In this research the effect of phosphorus solubilization bacterias as bio-fertilizers and phosphorous chemical fertilizer on quantity and quality yield of valerian was studied. This study conducted in the research farm of Institute of Medicinal Plants [IMP] through a factorial experiment based on a randomized complete blocks design with three replications. Factors of experiment included the inoculation bio-fertilizers factor in four levels: Azotobacter, Pseudomonas, mix of both and control [without inoculation], and also the phosphorous chemical fertilizer factor as super phosphate triple in three levels: 0, 50 and 100 kg ha[-1]. The bio-fertilizers using had a significant effect [p