Clay Dispersion in Typical Soils of North Cameroon as a Function of Ph and Electrolyte Concentration

Nguetnkam, Jean Pierre; Dultz, Stefan

doi:10.1002/ldr.1155

Cited by 20 publications

(9 citation statements)

References 42 publications

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“…Together with other soil properties, waterdispersible clay is used to understand the stability of the soil microstructure and its relationship with erosive processes (Igwe & Obalum, 2013), since the released particles can clog the pores, reducing the water flows and gases (Chaves et al, 2001;Nguetnkam & Dultz, 2014). In addition, these particles are easily transported in flowing streams to waterbodies (Demarchi & Zimback, 2014), favoring their contamination (Martin et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Farm systems, soil chemical properties, and clay dispersion in watershed áreas

Nunes

Cortez

Melo

et al. 2020

Pesq. agropec. bras.

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The objective of this work was to evaluate the effect of different farm systems on clay dispersion and its relationship with soil chemical properties and the no-tillage system participatory quality index (IQP), in watershed areas in the west of the state of Paraná, Brazil. The farm systems evaluated were: no-tillage; no-tillage with crop succession; no-tillage with soil disturbance; and conventional system. In addition, the farm systems were evaluated for their IQP. Soil samples were collected at 0.0-0.20-m soil depth, in 40 agricultural areas and in 6 native forests considered as references. The degree of clay dispersion, total organic carbon, pH (CaCl2), exchangeable potassium (K+), available phosphorus (P), exchangeable calcium and magnesium (Ca2++Mg2+), and potential acidity (H+Al3+) were determined. A linear multiple regression model was fitted by the method of least squares. The averages of clay dispersion degree per watershed were compared at 5% probability. The farm systems were compared by Scott-Knott’s test. Soil chemical properties showed a higher influence on clay dispersion than the different farm systems assessed. The no-tillage system alone showed the highest content of organic carbon, which was similar to those of the native areas. The conventional system and the no-tillage system with soil disturbance showed a lower IQP and a higher degree of clay dispersion than the areas with the no-tillage system alone. The IQP allows distinguishing the conventional system from the no-tillage system.

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Section: Introductionmentioning

confidence: 99%

Farm systems, soil chemical properties, and clay dispersion in watershed áreas

Nunes

Cortez

Melo

et al. 2020

Pesq. agropec. bras.

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“…Large organic poly‐anions can bind clay particles together into stable micro‐aggregates (Greenland, 1965), and a strong positive correlation between OC and soil aggregate stability has been reported (Chaney and Swift, 1984; Le Bissonnais and Arrouays, 1997). However, according to Nguetnkam and Dultz (2014), a significant increase in soil organic matter can generate excess negative charges that affect colloid repulsion and thereby increase clay dispersibility. In line with this, we observed strong positive correlations ( r = 0.87, 0.99, and 0.92 for Kalundborg soils in 2011, 2012, and 2011+2012, respectively) between OC and WDC content in Kalundborg soils (Fig.…”

Section: Resultsmentioning

confidence: 99%

Effects of Biochar on Dispersibility of Colloids in Agricultural Soils

et al. 2017

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The mobility of water-dispersible colloids (WDCs) in soil may be influenced by soil management practices such as organic soil amendments. Biochar has recently been promoted as a useful soil amendment, and extensive research has been devoted to investigating its effects on soil macroscopic properties and functions. However, there is limited understanding of the effects of biochar application on micro-scale particle dynamics. We conducted a field study to investigate the effects of the application of birch ( spp.) wood biochar on colloid dispersibility with respect to application rate, history, and physicochemical soil properties. Undisturbed soil cores (100 cm) were collected from the topsoil of two agricultural sites in Denmark with soils of sandy loam texture. The two sites received biochar at different application rates (0-100 Mg ha) and were sampled 7 to 19 mo later. The WDC content was determined using an end-over-end shaking method on 100-cm intact soil cores, and the colloid solution was analyzed for electrical conductivity, pH, and zeta potential. The WDC content increased with biochar application rate because of biochar-induced changes in soil chemistry and was strongly and positively correlated with the concentration of exchangeable monovalent cations in the soils. Biochar application increased pH and decreased electrical conductivity and zeta potential in the colloid suspension more in the short term (7 mo) than in the long term (19 mo). Thus, there is potential for biochar to induce short-term changes in soil solution chemistry in agricultural soils, which may influence the mobility of soil colloids.

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“…Marchuk and Rengasamy [29] mentioned that when organic matter is high in soils, water interaction leading to clay dispersion is minimal because charge on clays is reduced by clay-organic bonds, which are mostly covalent, or soil aggregates are enveloped by organic materials formed by covalent bonding. Igwe and Udegbunam [30] and Nguetnkam and Dultz [31] observed that the organic matter is one of the soil properties that influences the dispersed clay content in the soil, causing particle flocculation.…”

Section: Soil Characteristicsmentioning

confidence: 99%

Effect of Physic Nut Seed Cake on Common Bean Development and Clay Dispersion of Soil

Gavilanes¹,

Andrade²,

Figueiredo³

et al. 2020

Pol. J. Environ. Stud.

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Jatropha cake is a residue rich in nutrients that when used as organic fertilizer can contribute to plant development and soil properties improvement. Thus, this study aimed to evaluate Jatropha cake, digested and non-digested, on common bean plant (IPR-Colibri) growth and in soil properties. A greenhouse experiment was carried out in a sand-clay-loam soil to assess the effect of Jatropha cake (non-digested and digested) on soil Ca 2+ , Mg 2+ , Al 3+ , pH, organic carbon and clay dispersion in water and on plant leaf area, height, stem diameter, number of nodules, dry mass of root and shoot and, phosphorus (P) uptake in the shoot. The amount of Jatropha cake applied was calculated based on the equivalent to P content (50, 100, 200 and 300 kg P ha-1). It included two treatments: control and mineral fertilization. The Jatropha non-digested cake in doses of 200 and 300 kg P ha-1 inhibited seedling emergence, while a dose of 50 kg P ha-1 had positive influence on the development of the plants and in the P uptake in the shoot. There were water-dispersed clay values reduction and an increase in organic carbon with applications of Jatropha non-digested cake into the soil.

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Clay Dispersion in Typical Soils of North Cameroon as a Function of Ph and Electrolyte Concentration

Cited by 20 publications

References 42 publications

Farm systems, soil chemical properties, and clay dispersion in watershed áreas

Farm systems, soil chemical properties, and clay dispersion in watershed áreas

Effects of Biochar on Dispersibility of Colloids in Agricultural Soils

Effect of Physic Nut Seed Cake on Common Bean Development and Clay Dispersion of Soil

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