Biomass power plants are gaining popularity in recent years as an alternative source of energy to reduce the carbon emissions from fossil fuels. However, one of the major limitations is the lack of recycling of bottom ash (BA) which gets deposited in the soil. Currently, the landfills of the waste generated from the biomass power plant are at the saturation level. The bottom ash of the landfill causes environmental pollution due to its spread mediated by rainwater and wind. Therefore, we sought to analyze the characteristics and adsorption capacity of BA in the current study and elucidated the effect of BA on saline and heavy metal-contaminated soil to make it suitable for agricultural production. this study analyzes the characteristics and adsorption capacity of BA, and effect of saline and heavy metal soils with BA for use agriculture resource. We observed that the BA had 9.38pH and 23.21dS/m electrical conductivity (EC) while the carbon content was 63.78%. In Fourier transform infrared spectroscopy (FTIR) analysis, a peak for O-H bending at the BA, and a specific surface area of 28.48m²/g was observed. Theses results confirmed that the bottom ash exhibits characteristics similar to biochar. In saline soil, we evaluated nitrogen dissolution in the presences of BA and found that BA reduced the leaching of NH4+ and NO3- by up to 18% and 38%, respectively. The decrease in NH4+ leaching is thought to be the result of increased NH4+ adsorption due to the high pH of the bottom ash. These findings were consistent with the results obtained with biochar. Moreover, NO3- leaching was not found to be related to the adsorption capacity of BA, therefore, further research is needed to understand the reason underlying it. Next, we confirmed the impact of biomass power plant generated BA on plant growth in the saline soil and observed that BA increased the growth and nutrient uptake in the crop, In addition, water content, pH, EC, cation exchange capacity (CEC), soil organic matter (OM) and NH4+ were increased in the soil while the sodium adsorption ratio (SAR) was decreased to 5-15% due to increased content of Ca2+, and Mg2+ and fixing of Na+. These results confirmed that BA generated from the biomass power plant based on wood pellets improved soil quality and crop growth in saline soil by increasing the uptake of nutrients. Since BA contains certain heavy metals, it is necessary to ascertain the safety of the soil after the longer use of BA. To confirm the absorption rate of heavy metals using BA, heavy metal contaminated soil was used and the adsorption rate was analyzed with different weight, concentrations, time, and pH. The results suggested that the absorption rate was in the order of Pb> Zn> Cu> Cd> Ni, and the removal rate of Pb, Zn, Cu, Cd, and Ni by BA was 98.75, 49.75, 30.20, 32.46, and 36.10%, respectively. Also, the maximum adsorption amount by BA varied for different heavy metals due to environmental conditions. We confirmed that Zn, Ni, Cd, and Cu were adequate to Langmuir Isotherm While, Pb was adequate to Freundlich Isotherm. It was speculated that it would be more effective to remove heavy metals from the aqueous solution. Next, we analyzed the content of heavy metals absorbed by plants and found that the absorption of five types of heavy metals by crop plant was decreased with increasing concentration of BA. Precisely, the total heavy metal concentration decreased by about 34.9% and 57.3% in 1% and 5% BA, respectively. In addition, the heavy metal content remaining in the contaminate soil was higher in the BA treatment group than the untreated control (CN), and the highest heavy metal content was confirmed with 10% BA and 10% N+BA in soil. Conclusively, BA from biomass power plants based on wood pellet increases CEC, NH4+, and OM in saline soil, and improves soil physical structure and chemical properties through SAR reduction. It also reduces the salinity stress and increases nutrient uptake by crops. Our study confirmed that BA has the ability to fix heavy metals. The heavy metal content absorbed by crops were reduced by immobilizing the heavy metals in the soil through BA treatment. Based on these results, we propose that BA can be utilized as an agricultural resource to improve saline and heavy metal-contaminated soil and enhance crop growth and production.