A sodic soil is best described as which of the following?

Prepare for the Rangeland Soil Exam. Study with flashcards and multiple choice questions, each offering hints and explanations. Ensure success in your test!

Multiple Choice

A sodic soil is best described as which of the following?

Explanation:
Sodic soils are defined by having a high amount of sodium on the soil’s exchange sites, which causes the clay particles to disperse and the soil structure to break down. This leads to poor aggregation, crusting, and very slow infiltration and drainage, even if the overall salt level isn’t high. So the best description is a soil with high sodium content on the exchange sites, not necessarily high salinity (electrical conductivity), not simply high clay content, and not high organic matter. The key idea is that sodium dominates the cation exchange complex, driving the structural problems that define sodicity.

Sodic soils are defined by having a high amount of sodium on the soil’s exchange sites, which causes the clay particles to disperse and the soil structure to break down. This leads to poor aggregation, crusting, and very slow infiltration and drainage, even if the overall salt level isn’t high. So the best description is a soil with high sodium content on the exchange sites, not necessarily high salinity (electrical conductivity), not simply high clay content, and not high organic matter. The key idea is that sodium dominates the cation exchange complex, driving the structural problems that define sodicity.

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