Study On The Sustainable Effect Of Coal-based Solid Waste And Cattle Manure Compound Fertilizer In Sandy Soil Improvement

Inner Mongolia is rich in coal resources,and a large number of coal-based solid waste generated in the development and utilization of coal resources will cause environmental pollution if it is not effectively utilized.In the early stage of this experiment,coal-based solid waste(silica-calcium residue)and cow manure were applied in sandy land and plant planting was carried out.In this study,Helianthus annuus multiple cropping and Medicago sativa continuous greening were carried out after three years.The growth status,soil physical and chemical and microbial indicators,the most suitable ratio and amount of mixed geological fertilizer,and the long-term effect of geological fertilizer were measured and analyzed after three years.The mechanism,the most suitable crops for long-term planting,and the effects of mixed fertilizers on soil microbial diversity were tested,and then the soil fertility was evaluated,in order to improve desertification soil and produce economic benefits by planting agricultural and animal husbandry crops.When Helianthus annuus was first planted,the experimental group with the highest proportion of coal-based solid waste(group C,coal-based solid waste 40%)grew best;after three years of re-planting,soil fertility decreased with the increase of coal-based solid waste,and Helianthus annuus could still grow,but its growth condition was not as good as that of the initial one;it was suggested that additional fertilization should be applied to ensure the normal growth of crops when Helianthus annuus was re-planted later.The plant height and biomass of Medicago sativa increased after three years’ green return,and grew well with the proportion of coal-based solid waste reaching 40%.The best fertilizer effect was group C,which was suitable for Medicago sativa’s continuous green return for many years.Coal-based solid waste compound fertilizer in Medicago sativa planting experiment has a significant effect on the continuous improvement of desertified soil and the sustainable improvement of soil fertility.Compared with sandy soil in the experimental area,the application of coal-based solid waste and cow manure fertilizer can significantly change the composition of soil microbial community,and cow manure is the most important factor affecting the structure of soil microbial community.