Question

Soils with a high proportion of exchangeable sodium relative to other cations often show poor physical condition, with clay dispersion and reduced infiltration. What is the usual effect of high exchangeable sodium on soil structure?

A Improved aggregation and very rapid water infiltration
B Dispersion of soil aggregates, crust formation and poor permeability
C Very high phosphorus fixation but excellent structure
D Extremely low pH and high calcium content
E Complete absence of clay and organic matter
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