Abstract

The majority of potassium in the soil is in mineral form, making it unavailable to plants. K-solubilizing bacteria (KSB) increase potassium solubilization by decomposing rock-K, thereby improving soil fertility. The key purpose of this research is to isolate, characterize, and assess the potassium-solubilizing capacity of bacteria capable of solubilizing potassium from agricultural and forest environments. In this study, a total of 175 bacterial isolates capable of solubilizing potassium were isolated from soil samples taken from agricultural and forested areas in the Kahramanmaraş region. Twenty-eight bacterial strains demonstrated high potassium solubilizing capacity. Among these strains, AOB29 was recorded as the most effective in terms of potassium release, with a value of 64.03 mg L−1. The AOB29 strain was characterized phenotypically and phylogenetically, and it was identified as Bacillus mojavensis with 97% similarity based on its 16S rDNA sequence. The potassium concentration of this strain was tested at different temperatures (20 °C–40 °C), pH levels (pH 5–10), and mica doses (1–7 g L−1). The highest levels of potassium were determined as 58.7 mg L−1 at 35 °C, 64.9 mg L−1 at pH 6, and 57.1 mg L−1 with a mica dosage of 5 g L−1. Overall, the findings suggest that Bacillus mojavensis exhibits a noteworthy capability in solubilizing potassium.

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