Experimental Study on the Use of Engineering Spoil for Plant Growth Substrate

In order to effectively utilize the engineering waste material,engineering spoil with particle size less than 2 mm was mixed with natural surface soil to form substrate for plant growth in this study.The result indicated that 50%~70% volumetric ratio of engineering spoil was preferable;the spoil with higher weathering degree had better nutrient and pH condition,water retention capability and drought resistance that facilitate plant growth;however,the nutrient content in engineering spoil was relatively low,thus additional fertilizer was required to meet the needs of plant growth;there was no significant difference in three-phase composition among the substrates with different spoil and soil proportions,but obvious variation tendencies were observed in pH,nutrient contents,soil moisture constant,seed germination rate and plant survival rate.