Question

why the soil agriculturally important on alluvail soil ​

Answer 1

Here you go.....

The Alluvial Soil of the Ganga plain is formed due to the deposition of alluvium which is brought from the Himalayan region. ... This soil is agriculturally very important because it is a mixture of sand, clay and silt (loamy) which makes it very fertile. It is rich in potash and lime.

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Answer 2

it is rich in iron potash calcium etc.

it has moisture and retentive.