The Capacity of Soil Bacteria, Bacillus sp rif and Pseudomonas sp rif, in solubilizing Soil Phosphate and Potassium

Abstract

Increasing availability of phosphate (P) and potassium (K) in the soil can be driven by microbial activities, which are accurately able to dissolve P and K, known as nutrients hard to dissolve. The objectives of this research were to study the solubilizing activity toward soil P and K by P- and K- solubilizing bacteria in a sterilized and non-sterilized condition of Oxisol and Inceptisol. Marking procedure was performed on P- and K- solubilizing bacteria to scrutinize their activities in the soil. Marking process was conducted by utilizing resistance toward rifampicin antibiotic concentration of 50 µg.ml . The results of this study shown that the increasing availability of P was evident in both soil conditions (sterilized and non-sterilized). In Oxisol, P availability increased by 48.86%, while in Inceptisol it reached an increase of 187.77%, compared to the initial concentration. Likewise, K availability in Oxisol increased by 4.53 times, and it rose by 5.26 times in Inceptisol. The activities of P solubilizing bacteria, to be able to increase soil P availability, were also able to enhance soil's K content. Similarly, the K solubilizing bacteria were also capable of increasing P availability in both soils.