Soil Science

Revision

 
 

Dispersion characteristics are associated with particles of what size??

Correct! Clay particles interact through the layers of adsorbed water, and through the diffuse double layers of exchangeable cations where interparticle forces of attraction (flocculation) and repulsion (dispersion) are of importance. Sand and silt particles predominantly interact through direct particle contact.

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Which of the following statements is NOT true of slaking??

Correct! Diffuse double layer interactions are responsible for dispersion.

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Limestone can increase a soil's structural stability. Which of the following soil processes is NOT a result of limestone incorporation??

Correct! Limestone is applied on more acidic soils, as it raises the soil pH. On alkaline soils gypsum applications are recommended.

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The most important process contributing to a decline in aggregate stability is:?

Correct Organic matter is the most important substance for binding particles together. The other processes can all lead to breakdown of larger aggregates but do not necessarily affect aggregate stability.

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