To investigate the effects of bio-stimulators and bio-fertilizers on morphological traits of basil (Ocimum basilicum L.), a factorial experiment was conducted on the basis of randomized complete blocks design in three replicates at Institute of Medicinal Plants, ACECR. Bio-stimulators in four levels (control or no bio-stimulators and commercial formulations of aminolforte, kadostim and fosnutren at concentration of 1.5 L.ha-1) and bio-fertilizers in four levels (control or no bio-fertilizes and commercial formulations of nitroxin, supernitro-plus and barvar II at concentration of 0.5 L.ha-1) were the two studied factors. The results showed that the interaction effect of bio-stimulators and biofertilizers was significant (P<0.01) on all of parameters except for chlorophyll content (SPAD value). The maximum plant height (87 cm) in treatment of kadostim and nitroxin, secondary stem number (25.33) in treatment of kadostim and supernitro-plus, leaves number (206.33) and total dry weight (35.52 g) in treatment of aminolforte and nitroxin, stem diameter (7.16 mm) in treatment of fosnutren and nitroxin, and also flower dry weight (18.83 g) in treatment of fosnutren and bio-phosphur were obtained. In general, bio-stimulators and bio-fertilizers significantly increased the growth parameters of basil.
