Henry Kesaulya, Jeffij V. Hasinu, G.N.C. Tuhumury


The purpose of this research to know the physiologically character of Bacillus spp. rhizobacteria of potato var. Hartapel as promoting to plant growth. Rhizosbacteria was isolated and tested for producing ACC deaminase, IAA, GA, fixing nitrogen, dissolving phosphate, producing siderophores and hydrogen cyanide. Bacterial isolates Bacillus niabensis Strain PT-32-1, Bacillus subtilis Strain SWI16b, Bacillus subtilis Strain HPC21, Bacillus mojavensis Strain JCEN3, Bacillus cereus Strain HY, and Bacillus moyavensis UCMB 5075 are non-pathogenic thermotolerant. The consortium of bacterial isolates Bacillus subtilis Strain SWI16b with Bacillus subtilis Strain HPC21 are synergistic non pathogenic and have the most complete characters that can stimulant the growth and development in vitro of potato crops. These bacterial isolates can be used as active ingredients for biostimulant formulation to promote plant growth.

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