Impact of organic matter, iron oxides, alumina, silica and drying on mechanical and water stability of artificial soil aggregates. Assessment of new method to study water stability

Józefaciuk, Grzegorz; Czachor, Henryk

doi:10.1016/j.geoderma.2014.01.020

Cited by 79 publications

(33 citation statements)

References 58 publications

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“…As noted earlier, this would suggest that better soils also have higher resistance against land degradation, albeit that other unobserved effects might be at play as well. The reason that productive soils are more resistant against degradation processes like water (Stanchi et al, 2015) and wind erosion (Herrick and Beh, 2015) is closely related to prevailing aggregate stability (Colazo and Buschiazzo, 2010) that determines important soil production properties like infiltration and permeability while protecting soils against dispersive water and wind forces (Jozefaciuk and Czachor, 2014;Geng et al, 2015). Organic matter that acts as a binding agent and nucleus in the formation of aggregates is the most important component of soil aggregate stability.…”

Section: Resultsmentioning

confidence: 99%

Quantifying the impact of land degradation on crop production: the case of Senegal

2016

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Abstract. Land degradation has been a persistent problem in Senegal for more than a century and by now has become a serious impediment to long-term development. In this paper, we quantify the impact of land degradation on crop yields using the results of a nationwide land degradation assessment. For this, the study needs to address two issues. First, the land degradation assessment comprises qualitative expert judgements that have to be converted into more objective, quantitative terms. We propose a land degradation index and assess its plausibility. Second, observational data on soils, land use, and rainfall do not provide sufficient information to isolate the impact of land degradation. We, therefore, design a pseudo-experiment that for sites with otherwise similar circumstances compares the yield of a site with and one without land degradation. This pairing exercise is conducted under a gradual refining of the classification of circumstances, until a more or less stable response to land degradation is obtained. In this way, we hope to have controlled sufficiently for confounding variables that will bias the estimation of the impact of land degradation on crop yields. A small number of shared characteristics reveal tendencies of "severe" land degradation levels being associated with declining yields as compared to similar sites with "low" degradation levels. However, as we zoom in at more detail some exceptions come to the fore, in particular in areas without fertilizer application. Yet, our overall conclusion is that yield reduction is associated with higher levels of land degradation, irrespective of whether fertilizer is being applied or not.

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Section: Resultsmentioning

confidence: 99%

Quantifying the impact of land degradation on crop production: the case of Senegal

2016

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“…However, a recent review of the literature found that quantification and interpretation of aggregate stability data were hampered by a lack of standardized procedures (Almajmaie, Hardie, Acuna, et al, ). Therefore, it is not surprising that modifications and new methods are being investigated (Efrat, Rawlins, Quinton, Watts, & Whitmore, ; Józefaciuk & Czachor, ; Rawlins, Turner, Wragg, Mc Lachlan, & Lark, ; Rawlins, Wragg, & Lark, ; Saygin, Erpul, & Basaran, ).…”

Section: Introductionmentioning

confidence: 99%

An improved method for determination of aggregate stability using laser diffraction

et al. 2018

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Soil aggregate water stability is very important from both scientific and practical points of view. This stability is a critical factor in a soil's susceptibility to water erosion and, in turn, land degradation. The most popular measure of soil aggregate stability is the water resistance index (WRI), which is commonly measured using the wet‐sieving method. Using the laser diffraction method in order to observe changes in the median of the particle size distribution and determine soil aggregate stability was first proposed in 2010. However, the method was not suitable for weak aggregates. The aim of this study was to present a measure of aggregate stability using laser diffractometry, aggregate stability index (ASILD). Determination of the ASILD is based on the calculation of the directional coefficient of the straight line interpolated from 2 points: (a) the value calculated as the mean of the lower and upper nominal sieve sizes used for soil aggregate separation and (b) the median of the first measurement after the adding of the dry aggregates into the measuring system of the laser diffractometer. This proposed method for the calculation of the ASILD can be applied to very weak aggregates (i.e., aggregates that, in practice, are not at all water resistant). For weak and moderately stable aggregates, the correlation between ASILD and WRI is higher than 0.9. This method also enables differentiation between the water resistance of aggregates which, by the wet‐sieving method, are indistinguishable (i.e., those which have the maximum WRI).

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“…Formation of aggregates in soils is one of the most important problems of soil science. Formation of soil aggregates as basic unit of pedal soil structure is a function of physical forming forces (such as: inter and intramolecular forces, electrostatic, and gravitational (Grosbellet et al, 2011;Li and Fan, 2014;Hu et al, 2015) however, its stabilization is influenced by internal and external factors, and their interactions (Chenu and Cosentino, 2011;Paradelo et al, 2013;Šimanský et al, 2013;Jozefaciuk and Czachor, 2014;Šimanský and Bajčan, 2014). There are several mechanisms of aggregation.…”

Section: General Overview On the Micromorphological Analysismentioning

confidence: 99%

Application of various methodological approaches for assessment of soil micromorphology due to VESTA program applicable to prediction of the soil structures formation

Kolenčík¹,

Šimanský²

2016

Acta fytotechn zootechn

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Impact of organic matter, iron oxides, alumina, silica and drying on mechanical and water stability of artificial soil aggregates. Assessment of new method to study water stability

Cited by 79 publications

References 58 publications

Quantifying the impact of land degradation on crop production: the case of Senegal

Quantifying the impact of land degradation on crop production: the case of Senegal

An improved method for determination of aggregate stability using laser diffraction

Application of various methodological approaches for assessment of soil micromorphology due to VESTA program applicable to prediction of the soil structures formation

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