Study On Improving Alkali-saline Soil By Adding The Coal Ash And Sewage Sludge Reasonably In Zhenglu And Huafeng, Shandong Province

Based on investigation and sampling, this paper analyzed the component, texture , mineral assemblage, physical property for sewage sludge, coal ash and saline-alkali soils from mineralogy and pedology in Zhenglu and Huafeng, Sangdong province and optimized four formulas and carried out experiment for planting 14 mu black poplar in two sites.The study showed that the soils are saline-alkali soils (pH=9.15, total salt =0.143%, basification ratio= 36.5%, sodium adsorption ratio (SAR) =36. 5% ) in Zhenglu forestry centre;and the soils are salinized soils (pH=7.6, total salt =0.21%, SAR =8. 54%) in Huafeng mine district, both of them are viscidity texture, bad osmosis, poor organic matter, poor available phosphorus, poor plant effect before soil improving, It having micro-element, the coal ash of this region is lower gravity, loose and porous, high porosity and impound, excellent heat preservation, and is excellent improvement agent. The sewage sludge of this region have abundant organic material, available N, P ,K, micro-elements, beneficial microorganism and all deleterious elements are lower than nation criterion, which would improve saline-alkali soils.The experiment indicated that, the survival rate of the black poplar was up to 98%,the increment of poplar growth height was 3.21m per year, the increment of poplar bust was 29.1mm, in the improved soil in Zhenglu, in 6 months and 2 years. Now the black poplar , which their leaves are big, verdant and exuberance, reach fast growth and foison.The comprehensive analyses of the improved soil showed that the nutrients of improved soil were enhanced (for example, in Zhenglu and Huafeng, the organic material had increased 1-1.8 times 3.5-5.2 times, the available nitrogen had increased 1.6-1.3 times and 1.43-4.71, available P had increased 1.9-1.7 times and 8.74-27.87 times all beneficial micro-element and C/N meet demand), and the improved soils had good texture, excellent physical property, and had be desalted and dealkalization (for example, in Zhenglu and Huafeng, pH was 8.13 and 7.1, total salt content was lower than 0.061% and 0.07%, SAR decreased to 3% ± and 3.97%), the deleterious elements were lower than nation criterion. So the improved soils were excellent soil for plant.Moreover, this paper put up the optimized criterion and partitioning approaches for discard object, and setup technological specification and implement criterion, and pointed out mistaken partitioning would damage soil. From chemistry improvement, soil permeability, this paper analyzed the mechanism of improving saline-alkali soil, and carried out benefit analysis, and systematically illustrated economy, society, and environment benefit from utilization of coal ash and mire improving saline-alkali soil. This paper searched lots of document, examined innovation.In short, using of lots of material, component choosing, partition optimizing, planting experiment, improving mechanism, and setting up criterion, this paper provided systematical material and prepared for popularization application technique.Two waste materials cooperate to improve degenerated land, using castoff to reconstruct degenerate soil and changing castoff to useful material can get economy, society, and environment benefit, and was up to unite.