Dear Student,
Bhangar soils is the old alluvium while as the Khadar soils are the newer and younger soils.
Khader soils are found in the low areas of valley bottom,where as the the Bhangar is found on the higher reaches .
Bhangar is the terrace-like feature present above the flood plains of the rivers. It is composed of older alluvium. It is the largest part of the Northern Plain. The soil of this region contains calcareous deposits locally known as kankar .
The newer, younger deposits of the flood plains are called khadar . This region is very fertile as it gets renewed almost every year. Hence, it is ideal for intensive agriculture.
Regards