菌渣改良淤泥固化土及其促进黑麦草的生长

针对淤泥固化土板结程度高,养分不足等缺陷,采用菌渣辅以MgSO₄,通过物理掺和的方式改良固化土,用于园林绿化利用。通过对菌渣改良土的物理性状特性和养分含量分析、黑麦草种子发芽实验和盆栽实验,探究了菌渣掺量和粒径对淤泥固化土改良的影响。结果表明:淤泥固化土掺入40 g/kg的5~10 mm菌渣和0.2 g/kg MgSO₄后改良效果最佳,黑麦草株高增加了32.3%,干重提高了126.7%。菌渣的疏松多孔可改善土壤孔隙结构、降低土壤容重、提升土壤保水性;MgSO₄补充了缺失的有效镁和有效硫;菌渣自身的营养物质提升了土壤有机质、水解性氮、有效磷、速效钾等养分含量,进而提高土壤保肥能力。菌渣可作为土壤改良剂实现淤泥固化土的低成本改良利用。

MUSHROOM RESIDUES IMPROVE THE SLUDGE SOLIDIFIED SOIL QUALITY AND ENHANCE RYEGRASS GROWTH

Aiming at the defects of high hardening degree and insufficient nutrients of sludge solidified soil,the solidified soil was improved by physically mixing with mushroom residue and magnesium sulfate for landscaping.The effects of mushroom residue content and particle size on improvement of sludge solidified soil were studied by analysing the physical properties and nutrient content of mushroom residue improved soil,ryegrass seed germination test,and pot experiment.The results showed that the sludge solidified soil mixed with 40 g/kg with a particle size of 5~10 mm bacterial residue and 0.2 g/kg magnesium sulfate had the best effect.The plant height of ryegrass increased by 32.3% and the dry weight increased by 126.7%.Mushroom residue had loose and porous characteristics,which could improve soil pore structure,reduce soil bulk density and improve soil water retention;magnesium sulfate supplemented available magnesium and available sulfur in soil;and the nutrients of bacterial residue improved the content of soil organic matter,hydrolyzable nitrogen,available phosphorus,available potassium and other nutrients,and improved the ability of soil fertilizer retention.Bacterial residue can be used as a soil conditioner to realize the low-cost improvement and utilization of sludge solidified soil.