Extraction of potassium from K-feldspar through potassium solubilization in the halophilic Acinetobacter soli (MTCC 5918) isolated from the experimental salt farm

• K-solubilizing promising halophilic bacterial strain isolated from the salt pan.
• Molecularly identified strain Acinetobacter soli optimized for K-solubilization.
• It exhibited 66–68% K (w/w) w.r.t. cdw and 10.67% K in the fermentation broth.
• Sugarcane hydrolysate and wheat bran hydrolysate substituted for organic carbon.
• It is the first report of A. soli for promising potassic biofertilizer technology.

Out of 81 isolated bacteria from salt pan of CSIR-CSMCRI's experimental salt farm with salinity range from 10 to 24 Be′, one of the promising bacterial strain identified as Acinetobacter soli showed potassium solubilizing potential of 66-68% (w/w) w.r.t. cell dry weight. It was further optimized with cost effective carbon source for K release in the broth itself which was 10.67% of K (with respect to the K-feldspar present in the broth) utilizing sugarcane baggase hydrolysate with production age of 120 h.

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