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Heavy metals are widespread pollutants in soil and become environmental concern as they are non-degradable and highly persistent. Solid and/or liquid wastes containing toxic heavy metals may be generated in various industrial or mining processes. A heavy metal resistant bacterium may be present in the soil and mining site. As they already preconditioned by abundant heavy metals contaminant, the use of these bacterium is assumed to be effective in improving metals reduction. To obtain bacterial isolates highly capable of mercury (Hg) reduction, isolation activities have been conducted at selected sites of mining locations in South Sumatera. The highly potential bacteria possessing mercury reducing capability has been isolated from this site i.e. Pseudomonas fluorescens KTSS strain. Inoculating of 25% (v/w) suspension of P. fluorescens KTSS strain in soil material added 5000 ppb of mercury, could reduced about 53.3% of mercury soil contents. Best vegetative growth performance of cocoa seedlings was shown by the application of 15-1515 NPK conventional fertilizers in combination with the addition of 1.6 – 3.25 g of P. fluorescens KTSS bio-ameliorant/seed. A Greenhouse experiment results of cocoa seedlings were in concordance with those obtained from field trials of paddy.

Potensi Pseudomonas fluorescens strain KTSS untuk bioremediasi merkuri di dalam tanah The Potential use of Pseudomonas fluorescens KTSS strain formercury bioremediation in the soil