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The research on eco-efficiency and canbon reduction of recycling coal mining solid wastes: a case study of Huaibei City, China SOIL ORGANIC CARBON REDISTRIBUTION AND BUDGET OF EROSION AND DEPOSITION IN A SLOPING FIELD Effect of fly ash-filtered mud mixture on soil properties and radish yield and quality Effect of Shajiang black soil amended by coal fly ash on ecological factors and residue of heavy metal in wheat field Phosphate adsorption and desorption characteristics of several fly ashes Effects of the planting environment of lawn brick with fly-ash medium on the growth of turfgrass