Some physical properties of structural aggregates separated from organic waste-amended soils

J.S.C. Mbagwu, A. Piccolo
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引用次数: 16

Abstract

Surface (0–20 cm) samples from five soils amended with pig slurry, sewage sludge or cattle slurry were separated into four macro- and three micro-aggregate fractions by dry sieving. Relative to the controls, these amendments decreased the apparent density and dispersibility of the aggregates, increased slightly their water-retention capacity at —0·03 MPa tension, but had no significant effect on intra-porosity and particle-size distribution of the aggregates. On average, pig slurry reduced aggregate dispersibility by 34% in the sandy loam and 8% in the sandy clay loam Modena soils. Sewage sludge and cattle slurry reduced dispersibility by 41% and 26%, respectively, in the sandy loam Lamporecchio and sandy clay loam Cremona soils. The organic carbon contents of the aggregates accounted for 73–98% of variability in their tendency to disperse, whereas their silt plus clay contents accounted for 38–96% of variability in the moisture they retained at —0·03 MPa tension.

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有机废物改性土壤结构团聚体的一些物理性质
5种土壤表面(0-20 cm)样品经猪浆、污水污泥或牛浆改性后,通过干筛分离成4个宏观团聚体和3个微观团聚体。与对照相比,这些改性降低了团聚体的表观密度和分散性,在- 0.03 MPa张力下,团聚体的保水能力略有增加,但对团聚体的孔隙内部和粒径分布没有显著影响。平均而言,猪浆使砂壤土团聚体分散性降低34%,使砂质粘土壤土团聚体分散性降低8%。污水污泥和牛浆分别降低了砂质壤土和砂质粘土壤土的分散性,分别降低了41%和26%。在- 0.03 MPa张力下,团聚体的有机碳含量占其分散倾向变异的73-98%,粉砂加粘土含量占其保持水分变异的38-96%。
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