《》 Alluvial soil with more sand and silt than clay is being deposited in the flood plain areas along the river courses. Alluvial soil is also found in the higher areas above the flood plain covering a greater part of the Terai. ... Conversely, the nutrient content of old alluvial soils is very low.......

1. Alluvial soils are transported soil. Most of the soils are derived from the sediments deposited by rivers as in the Indo-Gangetic plain. Thus , the parent material of these soils is of transported origin.

2. These soils consist of varying proportion of sand,silt and clay. In the upper course of river, soil is coarse. In the middle course, it is less coarse,and finally grained in lower course.

3. Apart from the size of their grains or particles, soils are described according to their age as well. They are old alluvium and new alluvium. Locally, old alluvium is called BHANGAR and new alluvium is called KHADAR

4. The old alluvium often contains KANKAR nodules with calcium carbonate in subsoil . The new alluvium is more fertile than old alluvium. .........