Macroscopic Swelling and Hydraulic Conductivity Properties of Four Vermiculitic Soils

Rhoades, J. D.; Ingvalson, R. D.

doi:10.2136/sssaj1969.03615995003300030011x

Cited by 32 publications

(16 citation statements)

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“…The basic concept of Quirk and Schofield (1955) has been used in several studies McNeal et al, 1968;Rhoades and Ingvalson, 1969;Emerson and Chi, 1977). Several reviewers (Pratt and Suarez, 1990;Sumner, 1993;Levy et al, 1998) have summarized data from different soils where more than 20-25 per cent reduction in hydraulic conductivity occurred at electrolyte concentrations higher than the TEC of the silt-loam soil used by Quirk and Schofield (1955).…”

Section: Impact Of Sodicity On Soil Permeabilitymentioning

confidence: 99%

Degradation processes and nutrient constraints in sodic soils

Qadir¹,

Schubert²

2002

Land Degrad Dev

379

186

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Accumulation of excess sodium (Na þ ) in a soil causes numerous adverse phenomena, such as changes in exchangeable and soil solution ions and soil pH, destabilization of soil structure, deterioration of soil hydraulic properties, and increased susceptibility to crusting, runoff, erosion and aeration, and osmotic and specific ion effects on plants. In addition, serious imbalances in plant nutrition usually occur in sodic soils, which may range from deficiencies of several nutrients to high levels of Na þ . The structural changes and nutrient constraints in such soils ultimately affect crop growth and yield. The principal factor that determines the extent of adverse effects of Na þ on soil properties is the accompanying electrolyte concentration in the soil solution, with low concentration promoting the deleterious effects of exchangeable Na þ even at exchangeable sodium percentage (ESP) levels less than 5. Consequent to an increase in the use of poor quality waters and soils for crop production, the problems of sodic soils can be expected to increase in future. The mechanisms that explain sodic behaviour can provide a framework in which slaking, swelling and dispersion of clay together with nutrient constraints in sodic soils may be assessed so that the practices to manage such soils can be refined for long-term sustainable agriculture.

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Section: Impact Of Sodicity On Soil Permeabilitymentioning

confidence: 99%

Degradation processes and nutrient constraints in sodic soils

Qadir¹,

Schubert²

2002

Land Degrad Dev

379

186

View full text Add to dashboard Cite

show abstract

“…Recent evidence shows that dispersion of soil colloids is a determinant of a range of soil properties such as mineralogy, sodicity, pH, charge density vis-a-vis CEC, clay-organic interactions, and electrolyte levels (Collis-George and Smiles, 1963;Emerson, 1977;Quirk, 1977;Frenkel et aI., 1978;Oster and Schroer, 1979;Shanmugan than and Oades, 1983;Gupta et aI., 1984). Rhoades and Ingvalson (1969) concluded that dispersion rather than swelling was the operative process that lead to permeability reductions in vermicullitic soils. Also, the experimental evidence suggests that dispersion of soil aggregates within a soil would be expected to occur at a lower electrolyte concentration than that required to flocculate a clay suspension (Emerson, 1977;Quirk, 1977).…”

Section: G Dispersion Of Soil Particlesmentioning

confidence: 99%

Salt-Affected Soils: Their Reclamation and Management for Crop Production

Gupta

Abrol

1990

Advances in Soil Science

271

161

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“…The presence of naturally occurring gypsum in soils of arid regions acts as a source of calcium during leaching, and may lead to applications of gypsum being unnecessary. Other less soluble minerals also release calcium, but lead to slower reclamation or a smaller degree of protection from the development of sodicity (Rhoades and Ingvalson, 1969).…”

Section: Introductionmentioning

confidence: 99%