How are alluvial soils formed? How is Bangar different from Khadar?

(a) Alluvial soils are formed by the deposition of rivers.
(b) The features of the alluvial soils are explained as below:
(i) The alluvial soils consist of sand, silt and clay.
(ii) These soils contain adequate proportion of potash, phosphoric acid and lime.
(iii) These soils are ideal for the growth of sugarcane, paddy, wheat and other cereal and pulse crops.
(iv) Soils in the drier areas are more alkaline and need proper treatment and irrigation.
(v) These soils are of two types – old alluvial soil known as bangar and new alluvial soil known as khaddar.
(c) Places: These soils are found in the entire northern plains, Rajasthan, Gujarat (a narrow corridor), eastern coastal plains particularly in the deltas of the Mahanadi, the Godavari, the Krishna and the Kaveri rivers.
(d) Bangar is old alluvial soil and has higher concentration of banker nodules than the Khadar (new alluvial soil). It has more fine particles and is more fertile than the bangar.