Question

Explain the importance of alluvial soil?

Answer 1

Hint:
Alluvial soil is soil deposited by surface water. You will find them in rivers, plains and deltas (such as the Mississippi Delta), stream terraces, and areas called alluvial fans. The last category is the result of the spread of the soil in a triangular fan shape due to flooding.


Complete step by step solution:
Alluvial soils have been found in the valleys of the Terai region and the Zhongshan valleys around Kathmandu and Pokhara. These valleys are located between the Siwalik and Mahabharat mountains, which widen in some places to form flat, fertile valleys called Deng Valleys. New alluvial soils with much more sand and silt than clay are deposited in the floodplain areas along the river. Alluvial soils in higher areas above the flood plains were also found, covering most of Terai. The nutrient content of the new alluvial soil is medium to medium, depending on the time of cultivation. On the contrary, the nutrient content of the old alluvial soil is very low. The most fertile soil is alluvial soil. Alluvial soil is deposited by flowing rivers. It is usually formed by mixing fine particles of various soils with salt and other minerals and contains animal and plant matter in a completely decomposed state. It contains moderate amounts of phosphoric acid, potassium salt and lime. Therefore it is very widely used in agriculture. It has been found in the northern plains from Punjab to West Bengal and Assam, as well as in the Krishna, Godavari, Cauvery and Mahanadi deltas on the Indian peninsula.

Note:
They provide many functions in our ecosystem. Alluvial soil removes sediments and nutrients that flow from adjacent water. They can also remove other pollutants from the river and improve the water quality of downstream communities