The principal cation in alkaline soil is

^{+}

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^{+}

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^{2 +}

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Any of the above

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Solution

The correct option is C Ca $^{2 +}$
Alkaline soils are clay soils with high pH, a poor soil structure and a low infiltration capacity.pH of alkaline soil is > 8.5,
The principal cation in alkaline soil is Ca2+ because alkaline soils are primarily caused by a calcium carbonate-rich parent material weathering (developing) in an arid or dry environment.
Hence the principal cation in alkaline soil is Ca2+.
So, the correct answer is 'Ca2+'.

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