In recent years,the application of biomass charcoal in the resourceful utilization of agricultural wastes,fixed carbon and reducing discharge,contaminated soil remediation and soil improvement has attracted wide attention.Biochar is porous and has large specific surface area,good adsorption and water holding capacity.It can reduce the bioavailability of heavy metals by increasing soil pH value,reduce the movement of heavy metal ions in soil by cationic adsorption,and reduce the toxicity of heavy metals to crops by improving or improving soil fertility.Therefore,biomass charcoal has a good reme...