1. Acceleration of potassium release from K-bearing minerals in liquid medium by potassium-solubilizing bacteria.
- Author
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Setiawati, Tri Candra, Mandala, Marga, and Hartatik, Wiwik
- Subjects
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SCANNING electron microscopes , *BACILLUS (Bacteria) , *MALAYSIAN ringgit , *CASSAVA , *MINERALS - Abstract
Rocks containing K-bearing feldspathoids, such as leucites (KAlSi2O6) are a potential source of nutrient-bearing minerals with environmentally friendly attributes due to the gradual release of nutrients. Weathering of leucite naturally releases K elements in the soil through several mechanisms, including the activities of microorganisms. Therefore, this study aimed to use solubilizing bacteria to accelerate the release of K nutrients from the host minerals in a liquid medium. Different liquid media including water (H2O), cassava biomass extract, and leucite minerals from two deposits Mount Ringgit Situbondo and Muria Pati were used. Bacillus sp was selected as potassium-solubilizing bacteria, while the pH and potassium concentration changes were analyzed every two weeks until week 12. Furthermore, changes in morphological features of minerals and the presence of solubilizing P and K bacteria after treatment were observed using a scanning electron microscope (SEM) at week 12. The results showed that potassium dissolution increased with time in both leucites but the dissolution pattern in cassava biomass extract differed from water culture. Due to bacteria activity, the highest dissolution in the biomass extract for the leucite of Muria Pati deposit occurred in the sixth week, with a concentration of 40.30 meq.100g−1. The most significant dissolution in the water medium occurred in week 4 with a concentration of 1.13 meq.100g−1. Potassium solubilizing bacteria (KSB) activity in the extract cassava medium was higher than in water. In addition, the KSB activity on the mineral leucite surface persisted until week 12 as shown by SEM. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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