What are the reasons for the low percolation rate of clayey soil as compared to sandy soil.

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Clayey soil mainly contains clay.

Only a small percentage of sand and silt are present in the clayey soil.

Humus is also present in this soil.

All of the above

answer is D.

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Detailed Solution

Concept: Clay soil has exceptionally fine soil particles through which water cannot be effectively permeated. Though in sandy soil, they have huge soil particles so that water can be effectively sifted or permeated. This is the reason why there's a moro permeation rate in clay soil compared to sandy soil.
Therefore the reasons for the low percolation rate of clayey soil as compared to sandy soil are clayey soil mainly contains clay, only a small percentage of sand and silt are present in the clayey soil, and the humus is also present in this soil.
Hence, the correct answer is option 4.

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