Isolate P301 is an antibiotic producer bacteria isolated from rice plant ryzospher. This study was intended to identify the antibacterial activity of its culture broth againts Staphylococcus aureus ATCC 25923 and to identify the time optimization profileof secondary metabolite production from isolate P301 as producer antibiotics. Antibacterial activity was carried out using cup plate method by measuring the inhibitory zone around the wells. Optimization profile of production time of secondary metabolite was determined by plotting of the inhibition zone diameter versus incubation time. The result showed that isolate P301 culture broth inhibited the growth of S. aureus. According to the activity assay againts S. aureus, the optimum time for antibiotic production is after doing incubation for at least 11 days.
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