Abstract
The high salt content in saline soils is the main cause of low salinity soil fertility, especially phosphorus nutrients. The application of phosphate-solubilizing bacteria in saline soil is one method to increase phosphate availability in saline soils. The study consisted of two tests, namely (1) qualitative and quantitative testing of phosphate-solubilizing bacteria in saline conditions and (2) testing of the activity of phosphate solubilizing bacteria in saline soil. This study used Pseudomonas sp. and Bacillus valezensis (Soil Biology Laboratory collection), Inceptisol saline soil from Banongan and Agel Situbondo. The study aimed to determine the activity of phosphate-solubilizing bacteria on the solubility of phosphate in saline soil. The results showed that: (1) Pseudomonas sp. and Bacillus valezensis have a solubility index of 1.25 to 2.68 on solid Pikovskaya medium with some NaCl concentration. Quantitatively test on liquid Pikovskaya medium, water-soluble phosphate concentration about 4.84 ppm to 14.18 ppm and soluble phosphate (extract Bray) between 15.91 ppm to 21.58 ppm. In addition, (2) on saline soil showed that Pseudomonas sp. and Bacillus valezensis could increase phosphate availability by 11.61% to 72,89%. Based on the study results, the genus Pseudomonas sp. and Bacillus valezensis have the potential to increase phosphate availability in saline soils.
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