The market demand for potatoes is very high, and their cultivation can affect the environmental balance, so innovation in potato yield is needed. Medium land is an area with an elevation of 300-700mdpl. Crop yields in medium land are not optimal and more susceptible to disease than highlands. The role of microorganisms in PGPR and Tricho Powder can maximize crop yields and help reduce disease intensity. This study aims to determine the effect of different concentrations of commercial PGPR in increasing the yield of potato cultivation, the effect of different concentrations of Tricho Powder in suppressing the intensity of disease attacks, and find out one species in PGPR. This research was conducted with RAL (6 treatments with 4 replications). The treatments included P0 (Farmers’ Habits), P1 (PGPR 20mL), P2 (PGPR 40 mL), P3 (Tricho Powder 80gram/10Liter), P4 (Tricho Powder 150gram/10L), and P5 (PGPR 20mL+Tricho Powder) 80gr/10L). The data was then analyzed by ANOVA. If there is significance, a follow-up test is carried out, which is determined based on the KK value. The results showed that differences in PGPR concentrations positively affected potato yields with the combination treatment of PGPR 20mL/10L+Tricho Powder 80 gr/10L (P5), which was the best treatment producing the highest mean in each parameter. In the same treatment, disease intensity was reduced by 37.55% compared to the control treatment. Based on its ability to produce IAA from 5 isolates, only 1 isolate (IS 5) showed positive results and was continued to molecular tests.

Bolivian Rainbow Chili is one of the ornamental chili varieties which is unique in the form of its colorful fruit color. The vegetative growth of ornamental chilies requires additional nutrients and the role of microorganisms to obtain optimal growth. This study aims to determine the optimal growth of rainbow chilies using the application of PGPR biological fertilizer, a combination of PGPR biological fertilizer and NPK synthetic fertilizer, as well as a combination of PGPR biological fertilizer and compost organic fertilizer. This research was conducted with a completely randomized design (CRD). The data obtained were then analyzed by ANOVA and continued with the LSD test and Duncan’s test at the 5% test stage. The results showed that the combination treatment of PGPR and compost or PGPR and NPK provided optimal vegetative growth compared to single PGPR treatment.