Our results of mass spectroscopy showed that the strains
of B. subtilis LK14 give a high value of IAA on 9th day in their culture
medium which is 165.53 mMoL/50 mL LB broth (Fig. 4). The greater
amount of IAA produced by PGPEB in LB broth is because of
L-tryptophan, which is also confirmed from the results of Idris et al.
[5] revealed that IAA secretion can be increased by providing
tryptophan. In this way, the Inoculation of IAA producing bacteria