Journal ArticleDOI
Aggregate stability and assessment of soil crustability and erodibility: I. Theory and methodology
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In this paper, a unified framework for the measurement of aggregate stability is proposed to assess a soil's susceptibility to crusting and erosion, which combines three treatments having various wetting conditions and energies (fast wetting, slow wetting and stirring after pre-wetting).Abstract:
Summary
Crusting and erosion of cultivated soils result from aggregate breakdown and the detachment of soil fragments by rain, and the susceptibility of soil to these processes is often inferred from measurements of aggregate stability. Here, theories of aggregate breakdown are reviewed and four main mechanisms (i.e. slaking, breakdown by differential swelling, mechanical breakdown by raindrop impact and physico–chemical dispersion) are defined. Their relative importance depends on the nature of the rain, as well as on the soil's physical and chemical properties. The relations between aggregate breakdown, crusting and water erosion are analysed, and existing methods for the assessment of aggregate stability are reviewed. A unified framework for the measurement of aggregate stability is proposed to assess a soil's susceptibility to crusting and erosion. It combines three treatments having various wetting conditions and energies (fast wetting, slow wetting, and stirring after pre-wetting) and measures the resulting fragment size distribution after each treatment. It is designed to compare different soils, or different climatic conditions for a given soil, not to compare time-dependent changes in that soil.read more
Citations
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Journal ArticleDOI
Effect of decomposition intensity of incorporated chickpea manure on stability and saturated hydraulic conductivity of a clay loam and clay soil
TL;DR: The role of organic matter (OM) in soil aggregation and saturated hydraulic conductivity (Ksat) has long been recognized but their depedence on the intensity of decay is less studied as discussed by the authors.
Journal ArticleDOI
Agregação de um planossolo sistematizado há um ano e sob cultivo de arroz irrigado
José Miguel Reichert,Cláudia Liane Rodrigues de Lima,Ricardo Simão Diniz Dalmolin,Dalvan José Reinert,Celso S. Gonçalves,Marcelo Lopes Nunes +5 more
TL;DR: In this paper, the influence of soil properties (physical and chemical) on aggregation and test the similarity on aggregation of original soil horizons and land leveling was evaluated and found that the aggregation of land leveling is similar to E and B horizons of the original soil.
Journal ArticleDOI
Diverse effects of wetting and drying cycles on soil aggregation: Implications on pesticide leaching.
TL;DR: It is demonstrated that soil aggregation and disaggregation, induced by a WDC, suppresses and enhances herbicide mobility, respectively, and induces micron-scale changes in aggregate structure, which have a notable effect on pollutant mobility and fate in the environment.
Journal ArticleDOI
Evaluating the effect of soil internal forces on the stability of natural soil aggregates during vegetation restoration
TL;DR: In this paper, the effect of soil internal forces on the stability of natural soil aggregates during vegetation restoration has been studied, and the size distribution and stability of aggregates under different succession stages were investigated through dry sieving and wet sieving with ethanol and deionized water prewetting.
Journal ArticleDOI
Exploring visual soil evaluation and examination methods on highly-weathered tropical soil
Wim Cornelis,David Akodi,Everline Komutunga,Choice Agaba,Elizabeth Ahumuza,Kevin John Oratungye +5 more
TL;DR: In this article, visual soil evaluation and examination (VSEE) spade and core tests, which comprise rapid and simple methods to semi-quantitatively assess soil structure, have been tested.
References
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Journal ArticleDOI
Organic matter and water-stable aggregates in soils
Judith. Tisdall,J.M. Oades +1 more
TL;DR: In this article, the effectiveness of various binding agents at different stages in the structural organization of aggregates is described and forms the basis of a model which illustrates the architecture of an aggregate.
Journal ArticleDOI
Aggregate structure and carbon, nitrogen, and phosphorus in native and cultivated soils
TL;DR: In this article, the macroaggregate-micraggregate conceptual model is applied to help explain accumulation of soil organic matter under native conditions and its loss upon cultivation in North American grassland soils.
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A Direct Method of Aggregate Analysis of Soils and a Study of the Physical Nature of Erosion Losses1
TL;DR: The physical nature of the erosion process was studied on carefully controlled field plats of Cecil clay located on several slopes, and losses from this strongly aggregated soil occurred primarily in the form of water stable aggregates.
Journal ArticleDOI
Aggregate hierarchy in soils
J.M. Oades,A.G. Waters +1 more
TL;DR: In this article, a range of disaggregating treatments from gentle to vigorous were applied to different particle sizes and the results indicated the potential role of roots and hyphae in the stabilization of larger aggregates, and for fragments of roots as nuclei for smaller aggregates.
Journal ArticleDOI
The relation of raindrop-size to intensity
J. Otis Laws,Donald A. Parsons +1 more
TL;DR: The applicability of such results to conditions of natural rainfall has been thrown in doubt as discussed by the authors, and the results have been found to be affected by the drop-size and velocity of the artificial rains applied.