BIOSOLUBILIZATION OF ROCKS AND ROCK RESIDUES AS ALTERNATIVE SOURCES OF FERTILIZERS FOR AGRICULTURE
DOI:
https://doi.org/10.24933/rep.v7i2.313Keywords:
Biosolubilization; rock powder; potassium; microorganisms.Abstract
Potassium (K) is an essential nutrient for all living organisms and serves as a fundamental macronutrient for plant development. Rocks abundant in potassium can serve as alternative sources for direct soil application as fertilizers, aiming to reduce Brazil's agricultural demand, and reduce reliance on imported fertilizers. Additionally, it is well established that numerous soil microorganisms have the capacity to solubilize potassium found in minerals. In this context, this study sought to evaluate the potential of bacteria isolated from a tropical soil, in solubilizing potassium present in rocks and waste rock. A total of 72 bacterial strains were isolated, of which 5 showed potential for potassium biosolubilization, as determined through the halo test conducted on plates. In vitro potassium biosolubilization assays employing the selected strains were conducted in Aleksandrov’s medium, with rock powder as the sole source of potassium in the culture medium. The results demonstrated that all tested bacterial strains were capable of solubilizing the potassium present in the rock powder. Among the strains tested, IA13 exhibited the highest percentage of potassium extraction in comparison to the abiotic control (259.82% increase for Sample 8, 300% for Amazonite and 216.13% for Kamafugito). Consequently, the bacterial strains tested in this study exhibit potential for further application in biohydrometallurgical processes. These findings hold promise, considering the challenges and complexity associated with biological potassium extraction.
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