How are alluvial soil formed?
Alluvial soils deposited by the river systems are highly fertile and underlain by extensive aquifers resulting in the development of an extensive groundwater network for irrigation.Alluvial soil has the highest productivity with respect to other soils. They are depositional soils, transported and deposited by rivers and streams. Through a narrow corridor in Rajasthan, they extend into the plains of Gujarat. In the Peninsular region, they are found in deltas of the east coast and in the river valleys. In the Upper and Middle Ganga plain, two different types of alluvial soils have developed, viz. Khadar and Bhangar. Khadar is the new alluvium and is deposited by floods annually, which enriches the soil by depositing fine silts. Bhangar represents a system of older alluvium, deposited away from the flood plains.