Potential of rhizospheric bacteria isolated from ferns (<i>Nephrolepis</i> sp) growing in peatlands of West Kalimantan as biofertilizers

Abstract Peatlands are critical ecosystems known for their carbon sequestration capabilities and unique plant biodiversity. However, their acidic and nutrient-poor conditions pose challenges for plant growth and soil fertility. This study investigated the potential of bacteria isolated from rhizosphere of fern ( Nephrolepis sp) in peatlands to act as biofertilizers, enhancing soil fertility and plant growth. The research was carried out on peatlands at three distinct locations in Pontianak, West Kalimantan. Ferns, due to their high survival ability, dominate these peatlands and their rhizosphere is a potential source of beneficial bacteria. Eleven bacterial strains were successfully isolated from NA medium. The bacteria isolated on NA medium were then examined for their ability to solubilize phosphorus (P), fix nitrogen (N), and produce indole-3-acetic acid (IAA). Results showed that 5 isolates could solubilize P, 6 isolates could fix N, and 3 isolates were positive for IAA production. Additionally, 2 bacteria were found to have no ability to solubilize P, fix N, or produce IAA. This study highlights the potential of utilizing beneficial rhizobacteria from peatland ecosystems as biofertilizers, contributing to sustainable agricultural practices and the conservation of these sensitive environments.