Stability of Soil Aggregates as Affected by Electrolyte Concentration and Composition1

Abu‐Sharar, T. M.; Bingham, F. T.; Rhoades, J. D.

doi:10.2136/sssaj1987.03615995005100020009x

Cited by 92 publications

(44 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Micro-aggregate stability may be quantif ied by measuring clay-size particles (≤ 2 mm diameter) (van Olphen, 1977), specific silt-size particles (≤ 5 and/or ≤ 20 mm) (Abu-Sharar et al, 1987), or specific sandsize particles (≤ 125 mm) (Loch and Foley, 1994), although it is best quantified by analysing the overall size distribution of the fragments that result from the breakdown of aggregates in the macro-aggregate tests (Le Bissonnais et al, 1989;Chan and Mullins, 1994;. Pojasok and Kay (1990) measured the dispersible clay in the same soil sample where WSA was determined in order to save time and perform both measurements at the same energy input level.…”

Section: Introductionmentioning

confidence: 99%

Macro- and micro-aggregate stability of soils determined by a combination of wet-sieving and laser-ray diffraction

Amezketa

Aragüés

Carranza³

et al. 2003

Span. j. agric. res.

View full text Add to dashboard Cite

Soil structural stability affects the profitability and sustainability of agricultural systems. Different-sized structural units have different stability mechanisms and respond differently to such external factors as rain, wind, irrigation and management. A comprehensive analysis of the soils structural stability requires its characterization at the macroand micro-aggregate scales. We determined the aggregate stability of 36 soils at the macro-aggregate scale using wetsieving methods and of 20 soils at the micro-aggregate scale using laser-ray diffraction techniques. All the tests gave consistent estimates of aggregate stability. Most soils were homogeneous and quite stable at the macro-aggregate level as determined by the «water stable aggregate» parameter, but differed significantly among them and were quite unstable at the micro-aggregate level as determined by the «mean weight diameter of micro-aggregates» parameter. Slaking induced by the fast wetting of aggregates was the main destabilizing mechanism in these soils (88% of the soils had slaking stability index values < 0.5), whereas most soils were quite tolerant to the mechanical shaking of aggregates (89% of the soils had stirring stability index values > 0.5). The combination of the macro-and micro-aggregate stability tests is a consistent way for describing the structural stability of the studied soils.Key words: soil structural stability, wetting, stirring, aggregate-breakdown, slaking stability index, stirring stability index. ResumenDeterminación de la estabilidad de macro-y micro-agregados del suelo mediante una combinación de técnicas de tamizado en húmedo y difracción de rayos láser La estabilidad estructural del suelo afecta a la rentabilidad y sostenibilidad de los agrosistemas. Los agregados de distintos tamaños son estabilizados por mecanismos diferentes, y responden de forma diferente frente a la lluvia, el viento, el riego y otras prácticas agronómicas. Un análisis completo de la estabilidad estructural de los suelos requiere su caracterización a nivel de macro-y micro-agregados. En este trabajo se ha determinado la estabilidad de macroagregados de 36 suelos mediante métodos de tamizado en húmedo, y la estabilidad de microagregados de 20 suelos mediante técnicas de difracción de rayos láser. Todos los ensayos estimaron de forma consistente la estabilidad de agregados. La mayoría de los suelos se comportaron homogéneamente y de forma bastante estable al nivel de macroagregados, de acuerdo con los valores del parámetro «agregados estables en agua», mientras que se comportaron de forma muy diferente y muy inestable al nivel de microagregados, de acuerdo a los valores del parámetro «diámetro medio ponderado de los microagregados». La desagregación inducida por la humectación rápida de los agregados (slaking) fue el mecanismo más desestabilizador en estos suelos (el 88% de los suelos presentó índices de estabilidad frente a slaking < 0,5), mientras que la mayoría de los suelos fueron bastante estables frente a la agitación mecánica de lo...

show abstract

Section: Introductionmentioning

confidence: 99%

Macro- and micro-aggregate stability of soils determined by a combination of wet-sieving and laser-ray diffraction

Amezketa

Aragüés

Carranza³

et al. 2003

Span. j. agric. res.

View full text Add to dashboard Cite

show abstract

“…The soil salinity was measured for the soil samples after being analyzed by TypoSoil™ and by using a multi-parameter meter with soil solution of (1:5 soil/water ratio). Salinity affects the soil flocculation by enhancing the bending of fine particles together (Abu Sharar et al, 1987), side by side with the aggregate size and the drying of the soil samples could lead to disjoining the aggregates and increasing gradually the sample volume. Nevertheless, this part of the shrinkage curve was excluded in the analysis.…”

Section: The Measured Water Retention and Soil Shrinkage Curvesmentioning

confidence: 99%

Physics of the soil medium organization part 2: pedostructure characterization through measurement and modeling of the soil moisture characteristic curves

Assi

Braudeau

Accola

et al. 2014

Front. Environ. Sci.

View full text Add to dashboard Cite

“…They are moderately calcareous with low levels of organic carbon and nitrogen. All ESP values were lower than 5%, this threshold was considered by Shainberg and Letey (1984) and Abu-Sharar et al (1987) as level separating sodic from non sodic soils.…”

Section: Experimental Plot Designmentioning

confidence: 99%

“…These conditions may further compromise the activity of microorganism and plant growing (Wong et al, 2008;Raj Setia and Marschner, 2013). Moreover, in saline soil, improving structural stability may be achieved by increasing soil electrolyte concentration or/and decreasing solidity (Abu-Sharar, 1987). In addition, structural stability of aggregates depends on the interaction among other factors which might be intrinsic or extrinsic to soil, by which organic matter occupies a central position.…”

Section: Introductionmentioning

confidence: 99%

Short-term effect of organic residue incorporation on soil aggregate stability along gradient in salinity in the lower cheliff plain (Algeria)

Benbouali¹,

Hamoudi²,

Larich³

2013

Afr. J. Agric. Res.

View full text Add to dashboard Cite

A field experiment was performed to examine the effectiveness of adding two kinds of organic materials (wheat Straw and cattle manure) on the soil aggregate stability along a gradient in salinity in the lower cheliff plain (western Algeria). The experiment was set up in a factorial design by complete randomized blocks with three replicates. The treatments were applied at a rate of 4 g C kg -1 soil. One year after organic amendments, mean weight diameter (MWD) was measured using the Le Bissonais method (1996). Other soil properties involved in saline soil aggregation were also measured, namely, electrical conductivity (EC), exchangeable sodium percentage (ESP), pH, cation exchangeable capacity (CEC), porosity, saturated hydraulic conductivity (K sat ), microbial biomass carbon (MBC) and hot water extractable polysaccharide (HWEP). The results demonstrated a significant effect of organic inputs in improving aggregate stability; the effectiveness was related to the type of aggregate stability test that has been used, organic matter type and the level of soil salinity. The wheat straw proved to be more efficient in soil aggregation than cattle manure. Most of the considered soil properties were significantly influenced by organic inputs. Overall, correlation analysis revealed that enhanced microbial biomass was the most important factor in stabilizing soil aggregates (r = 0.72 with MWD MB and r = 0.64 with MWD FW ). Therefore, MWD influences soil porosity (r = 0.67 with MWD MB and r = 0.56 with MWD FW ), which in turn resulted in increased hydraulic conductivity (r = 0.77 with MWD MB and r = 0.87 with MWD FW ).

show abstract

Stability of Soil Aggregates as Affected by Electrolyte Concentration and Composition1

Cited by 92 publications

References 17 publications

Macro- and micro-aggregate stability of soils determined by a combination of wet-sieving and laser-ray diffraction

Macro- and micro-aggregate stability of soils determined by a combination of wet-sieving and laser-ray diffraction

Physics of the soil medium organization part 2: pedostructure characterization through measurement and modeling of the soil moisture characteristic curves

Short-term effect of organic residue incorporation on soil aggregate stability along gradient in salinity in the lower cheliff plain (Algeria)

Contact Info

Product

Resources

About